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# GENERAL PHYSICS 2 PHYS 1120

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This 26 page Class Notes was uploaded by Mrs. Peter Toy on Friday October 30, 2015. The Class Notes belongs to PHYS 1120 at University of Colorado at Boulder taught by Staff in Fall. Since its upload, it has received 8 views. For similar materials see /class/232110/phys-1120-university-of-colorado-at-boulder in Physics 2 at University of Colorado at Boulder.

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Date Created: 10/30/15

Concept Tests Final Review Quiz for the arrogant physicist Name a commonlyoccurring physical phenomenon which remains completely mysterious despite many decades of intense study We have no equations which describe it no theory which explains it We are not even sure how to measure it Answer Consciousness selfawareness CTFl How many uA in a mA A 10 B 1000 C 100000 D 1000000 CTF2Calculator question 105 A 1E5 B 10E5 C something else CTF3 A square with edge length L is made larger and larger mm a length of perimeter As the square grows the ratlo area A increases B decreases C remains constant CTF 4 A charge q is released from rest at point in empty space were there may be E andor Bfields There are no forces on the charge except for the forces due to the E andor B fields no gravity etc The charge is observed for a short while and is seen to move along a curved path Which one statement must be true A There might be only a nonzero Efield present and no Bfield B There might be only a nonzero Bfield present and no Efield C There must be both a nonzero Efield and a nonzero Bfield present D None of the above statements must be true CTFS Points A and B are distances r and Zr respectively from a point charge q What is the magnitude of the voltage difference AV 2 VB VA C T D None ofthese CTF6 A charge q is located at the center of an gaussian cubical box as shown A student is asked What is the electric flux qDE though the top face of the cube Is the answer hard to calculate or easy to calculate A Easy B Hard q CTF 7 A capacitor with capacitance C is attached to a battery with voltage V What is the ux 39d through the cubical volume shown The end faces of the cube are within the metal plates of the capacitor CV 2CV A 80 B 80 C zero D None of these CTF8 A resistor is plugged into a 120VAC wall socket The graph below is either voltage V across current I in or power P dissipated in the resistor vs time What could the graph be A Vonly BIonly CVorIonly D V I or P E something elsedon t know CTF9 A capacitor has a voltage V across its plates An electron initially at rest is released from a point very close to the negative plate of a capacitor and it accelerates toward the positive plate The electron has charge e and mass m There is no gravity in this problem and you may assume that the motion of the electron is m relativistic What is the final speed of the electron just before it collides with the positive plate A 2 e V B m a 39 m 39 2 e V 2 V C e D m e V m V E None of these CTF10 When the switch is closed the current 11 through resistor R1 Ibat A increases B decreases I gt C stays the same V R1 l1 R CTFl 1 At time to a particle with charge q has instantaneous velocity gt A VO as shown and in moving in a uniform magnetic field B B X A True or B False V E B As time increases the Xcomponent of the q velocity vX remains constant A True or B False The KB of the particle remains constant as time increases CTF12 A long solenoid with many turns per length has a uniform magnetic field B within its interior Consider the imaginary rectangular path of length c and width a with one edge entirely within the solenoid as shown I 0 21 Whatis z di O 2Bc D None of these A Bc B 2Bc a C The solenoid has n turns per length and carries a current I What is d1 A uonl B uoncl c u0nacl D None of these CTF13 A single circular loop of wire of radius R surrounds a long solenoid of radius r turns per length n carrying a current I The diagram shows the endon view of the situation What is the magnetic flux through the single wire loop solenoid A uonl 7ch B or r22R C 75R2uOI27R D uonl Tcr2 E None of these CTF14 The following questions refer to the circuit shown which has two resistors both with resistance R an inductor with inductance L a battery with constant voltage V and a switch which can be in position A or B Suppose the switch has been in position A for a long time and is then switched to position B 1 Immediately after the switch is thrown to B what is the current in the inductor A zero B VR C VZR D 2VR E None of these 2 Immediately after the switch is thrown to B what is the voltage across the inductor L a A zero B V C 2V D V2 E None ofthese CTF15 A handcranked electrical generator is attached to a resistor R The generator is turned at a constant rate which causes an AC current to ow in the resistor Suddenlythe value of the resistance R increases Does the generator get easier or harder to turn A Easier B Harder C No change in difficulty CTF16 An radio tower is emitting a singlewavelength monochromatic EM wave in all directions isotropically A technician measures the electric field amplitude E as 100 meters from the tower and again 400m from the tower What is the ratio E100E400 Hint Intensity is proportional to the square of the amplitude I oc E2 0 o o E measured E ntasued at 100m at 400m s A 2 B 4 C 16 D 162 256 E None ofthese CTF17 A ray of light is sent into an optic fiber at an angle such that the angle with the normal to the pipe is 6 The fiber has an inner core with indeX ni and an outer cladding with indeX no If noni is not large enough there will be no internal re ection What is the minimum value of noni required for total internal re ection to occur A sine B sin3919 C lsine D None of these CTF18 Is the image on a movie screen real or Virtual A real B Virtual Is the image seen with a Virtual reality headset real or Virtual A real B Virtual Exam 1 Review Rll Three equal mass charges are released from rest at the positions shown on the XaXis Which mass has the largest initial acceleration Q Q Q e e gtX A B C A A B B C C D 2 of the masses have the same acceleration E Some other answer RIZ Four charges are arranged as shown all a distance r from the origin What is the magnitude of the Efield at the origin in units if kQr2 Y Q A A 2Q 20 X 4Q A l B 2 C 3 D 4 E None of these RI3 A line of charge has length L and total charge Q What is the relation between dX and dQ A dX QL dQ B dQ LQ dX C dQ QL dX D None dE 1point A 9 h dX dQ l l gt O X gt At point A what is the magnitude of the field dE due to the element of charge dQ de de de A we 3 0 ma What is the correct expression for sine X h h X Ah2xz Ohms What is the correct expression for dEX kQL01X khQLdx kXQLdx B A W m C h2X232 RI4 A point charge Q is brought near a large metal plate and the field lines are as shown Does the plate have a nonzero net charge A Yes B No Is the magnitude of the charge on the plate greater less or the same as the charge Q A greater B less C same RI5 If the electric field E is nonzero everywhere on a closed surface S can the flux over a surface be zero da 2 O S A Yes B No If the electric field E is constant everywhere on a closed surface S can you conclude that EB d5 E Eda S s A Yes B No RI6 A long straight line of charge has charge per length 7b Does Gauss s law allow you to compute the flux 1 E d5 through the spherical surface of S diameter D centered on the line A Yes B No Il I k I I D I Consider now the open hemispherical surface shaped like a cup centered on the line as shown Does Gauss s law allow you to compute the fluxE da through this surface Taking the outward normal direction as S positive A Yes B No RI7 The electric field throughout a region of space is given by the formula E A y PAC B X 3A7 where Xy are the coordinates of a point in space and A B are constants What is B 9 A Ay B BX C AX D By E None of these RI8 A spherical shell with a uniform positive charge density on its surface is near a positive point charge Is the electric field inside the sphere zero A E0 inside B E i 0 inside C Not enough info to answer RI9 A spherical shell of charge has a nonuniform distribution of charge over its surface Is the electric field everywhere within the shell zero A Yes B No RI 1 0 Consider a point charge Q oncenter within a spherical metal shell Does Gauss s Law allow you to compute the total charge on the inside surface of the shell A Yes B No Does the total charge on the inside surface of the shell depend on the total net charge of the whole shell A Yes B No Consider a dipole within a spherical metal shell Is there a nonzero surface charge density 6 on the inside surface of the shell A Yes B No RIl 1 Consider two very large parallel metal plates in static equilibrium Consider also the gaussian surface shown It is proposed that the charge densities on the four surfaces are as shown Is this possible A Yes B No 0 0 Concept Tests Final Review Quiz for the arrogant physicist Name a commonlyoccurring physical phenomenon which remains completely mysterious despite many decades of intense study We have no equations which describe it no theory which explains it We are not even sure how to measure it CTF l How many uA in a mA A 10 B 1000 C 100000 D 1000000 Answer 1000 microamp uA 10396 A milliamp mA 10393 A CTF 2Calculator question 105 A 1E5 B 10E5 C something else Answer 1E5 1 X 105 CTF 3 A square with edge length L is made larger and larger meme 9 length of perimeter A th th t s e square grows e ra 10 area A increases B decreases C remains constant Answer length g The ratio decrease as L increases area L L CTF 4 A charge q is released from rest at point in empty space were there may be E and or B elds There are no forces on the charge except for the forces due to the E and or B elds no gravity etc The charge is observed for a short while and is seen to move along a curved path Which one statement M be true A There might be only a nonzero Efield present and no B field B There might be only a nonzero B field present and no Efleld C There must be both a nonzero Efield and a nonzero B field present D None of the above statements must be true Answer This is a very tricky problem trickier than what I would give on the Final You have to distinguish carefully between the words quotmightquot and quotmustquot The correct answer is There might be only a nonzero Efleld present and no B field If the particle is in a curved Efield it will accelerate along a curved path It is true that this path could be caused by a B and Efleld acting together but it is not true that the path must be caused by a B and Efield together CTF S Points A and B are distances r and Zr respectively from a point charge q What is the magnitude of the voltage difference AV VB VA kq ikq G L Lw A r B2r A B q 3 kq C D None ofthese 2 r k k l k Answer AV VB VA Z q q q The question asks for the magnitude of r r r the voltage difference so we drop the minus sign CTF 6 A charge q is located at the center of an gaussian cubical box as shown A student is asked What is the electric ux GDE though the top face of the cube Is the answer hard to calculate or easy to calculate q 04 A Easy B Hard Answer Its easy if you remember Gauss s Lawn1E dA Qmside The total ux through 80 the entire box is qso By symmetry the ux through one face is 16 th the ux through the whole box Flux 16 qso CTF 7 A capacitor with capacitance C is attached to a battery with voltage V What is the ux 39 d through the cubical volume shown The end faces of the cube are within the metal plates of the capacitor CV ZCV A B 8O 8O C zero D None ofthese 1 Answer Zero In electrostatic situations the Efield inside a conductor is zero Since E0 on the right and left ends of the cubical imaginary box the ux through those ends is zero On the sides ofthe box Eda 0 since Ema So the total ux is zero Since d5 0 then by Gauss s Law the total charge must be zero within the box must be zero so we have proven that the two plates must have equal and opposite charge densities CTF S A resistor is plugged into a 120VAC wall socket The graph below is either voltage V across current I in or power P dissipated in the resistor vs time time What could the graph be A V only B I only C V orI only D V I or P E something else Answer V or I only The power P IV 12R is always positive quot IF P I l l tlme lorV CTF 9 A capacitor has a voltage V across its plates An electron initially at rest is released from a point very close to the negative plate of a capacitor and it accelerates toward the positive plate The electron has charge e and mass In There is no gravity in this problem and you may assume that the motion of the electron is mrelativistic What is the nal speed of the electron just before it collides with the positive plate 2eV m A B gt m 2eV 2 V 016 D meV m V E None ofthese Answer lAKE lmv2 eV m 2 CTF 10 When the switch is closed the current 11 through resistor R1 A increases B decreases lbat C stays the same Answer stays the same The resistor R1 is attached to the battery with constant voltage V Ohm s Law says V 11 R1 Regardless ofwhether the switch is open or closed the current thru R1 is 11 VRl What changes when the switch is closed is the total current thru the battery 1m 11 12 gt CTF ll At time to a particle with charge q has instantaneous velocity V0 as shown and gt A in moving in a uniform magnetic eld B 2 B X V A True or B False As time increases the Xcomponent of the velocity vx remains constant B q Answer True the force F qv gtlt Bis into or out of the page depending on the sign of q The direction of the force is perpendicular to the XaXis the direction of B so Fx max 0 ax 0 means vxconstant A True or B False The KE of the particle remains constant as time increases True The magnetic eld can do no work on the particle since F J 6 always The KE can change only if work is done by the workenergy theorem AKE Wm CTF 12 A long solenoid with many turns per length has a uniform magnetic eld B within its interior Consider the imaginary rectangular path of length c and width a with one edge entirely within the solenoid as shown C Wh dT a a is a A Bc B 2Bc a O The solenoid has n turns per length and carries a current I What is d1 A uonl B uoncl C u0nacl C 2Bc D None ofthese D None ofthese Answer Bc Only the bottom of the loop contributes to the line integral On the sides BJ dl so Bdl 0 On the top ofthe loop outside the solenoid B 0 CTF 13 A single circular loop of wire of radius R surrounds a long solenoid of radius r turns per length n carrying a current I The diagram shows the endon View of the situation What is the magnetic ux through the single wire loop A uonI nRz B uol rzZR solenoid C TERZJOI21TR D uonl 11r2 E None ofthese Answer uonl nrzv NOT uonl nRz The B eld is nonzero only within the solenoid so only the area of the of the solenoid contributes to the integral da CTF 14 The following questions refer to the circuit shown which has two resistors both with resistance R an inductor with B L inductance L a battery with constant V voltage V and a switch which can be in R position A or B Suppose the switch has been in position A for a long time and is then switched to position B 1 Immediately after the switch is thrown to B what is the current in the inductor A zero B VRC V2R D 2VR E None ofthese Answer The current thru L just after the switch goes to B must be the same as when the switch was at A I V R 2 Immediately after the switch is thrown to B what is the voltage across the inductor L a A zero B V C 2V D V2 E None ofthese Answer 2V By Kirchhoff39s voltage law the voltage across the inductor L must be the same magnitude as the voltage across the two resistors V I 2R VR2R 2V CTF lS A handcranked electrical generator is attached to a resistor R The generator is turned at a constant rate which causes an AC current to ow in the resistor Suddenlythe value of the resistance R increases Does the generator get easier or harder to turn A Easier B Harder C No change in difficulty Answer Easier The power is P IV V emf constant amplitude AC since crank is turned at constant rate Current I VR So P I V Vz R As R increases the power P decreases Less power means crank is easier to turn emf 1 R CTF 16 An radio tower is emitting a singlewavelength monochromatic EM wave in all 139 quot k39 r39 quotJ A 39 39 39 measures the electric eld amplitude E as 100 meters from the tower and again 400m from the tower What is the ratio E100 E400 Hint Intensity is proportional to the square of the amplitude 1 oc E2 0 s A 2 B 4 C 16 D 162 256 E None ofthese Answer 4 Intensity I i2 oc i2 cx E2 3 E oc i 411R R R CTF 17 A ray of light is sent into an optic ber at an angle such that the angle with the normal to the pipe is 9 The ber has an inner core with index ni and an outer cladding with index no If noni is not large enough there will be no internal re ection What is the minimum value of noni required for total internal re ection to occur A sine B sin3919 C lsinG D None ofthese Answer lsinG Snell s Law says ni sineC n0 sin900 no noni lsinGC CTF 18 Is the image on a movie screen real or Virtual A real B Virtual Answer Real When the rays actually converge at a point in space where you can put a screen to see the image then the image is real Is the image seen with a Virtual reality headset real or Virtual A real B Virtual Answer Virtual The image must be further than about 25cm from the viewer39s eye for the Viewer to be able to focus on the image Ideally the image should be at in nity so the veiwer can focus on the image with relaxed eye 4 H K j C image

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