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## General Physics

by: Nichole Keebler

30

0

4

# General Physics PHYSICS 104

Nichole Keebler
UW
GPA 3.95

Staff

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COURSE
PROF.
Staff
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Class Notes
PAGES
4
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KARMA
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## Popular in Physics 2

This 4 page Class Notes was uploaded by Nichole Keebler on Thursday September 17, 2015. The Class Notes belongs to PHYSICS 104 at University of Wisconsin - Madison taught by Staff in Fall. Since its upload, it has received 30 views. For similar materials see /class/205232/physics-104-university-of-wisconsin-madison in Physics 2 at University of Wisconsin - Madison.

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Date Created: 09/17/15
Faraday s Law Magnitude Emf Change in magnetic FluxTime 8NNm At tf ti Since dgt B A cos03 things can change 1 Area of loop 2 Magnetic field B 3 Angle 0 between Area A normal and B 101504 UWisconsin Physics 104 Fall 2004 Preflight Review EMF In the figure is shown a loop in edge view rotating in a horizontal magnetic field The axis of rotation is perpendicular to the page and is shown by the black dot in the figure The dimension of the loop perpendicular to the page to the page is The parts of the loop perpendicular to the page are moving at velocity v as shown and the present instant the normal to the loop makes an angle of 30 degrees with the B field Which of the following statements is true at the instant shown the emf around the loop is increasing the emf around the loop is decreasing the emf around the loop is not changing PFli FluX iS decreasing EMF 8 2 NB Faraday39s law 4 At 300 4 normal B Lenz39s law EMF opposite in direction 8 is increasing 101504 UWisconsin Physics 104 Fall 2004 Change B Which way is the magnet moving if it is inducing a current as shown 1 UIO Current creates flux up This must be opposing increase in ux down So magnet must be falling down 101504 UWisconsin Physics 104 Fall 2004 101504 Lenz s Law Direction Emf opposes change in ux EMF does NOT oppose B eld or ux EMF opposes the CHANGE in ux UWisconsin Physics 104 Fall 2004 101504 Direction Lenz s law 39i s N Tat3quot i45 n pi i i l a I l MI I J W 15 B ii i in a H N s 3 fill b K Ii 391 139 I u I All failaruOKSsCLvie Publishing CompanyHP c UWisconsin Physics 104 Fall 2004 101504 1 faster 3 at the same speed Decreasing R increases I Increases opposing field which 3 makes magnet fall slower Change B f reduce the resistance in the wire the magnet will fall UWisconsin Physics 104 Fall 2004 Change B II As current is increasing in the solenoid what direction will current be induced in ring K ii39 1 1 Flux 2 1s proportlonal 5E to current through 1 quot39 quot ii 1 Same as solenoid qusz Ml i I changing 2 Opposite of solenoid Changing current in l 3 No cumen creates emf in 2 GB39Vanome e39 g2 44 atth Minimum in innsn4 u i mph i mm mm 7 mm H i mph i mm mm a Mutual Inductance Faraday s Law Safety Inductance Opposing EMFs due to the two loops cancel out preventing a large induced EMF on the body A11 gaffe 0 Recall Faraday s Law E If 7quot Flux is proportional to current N41 L1 Of the Washing 39 Changing current induces an emf 7 A machine induced emf opposes change in current 5 7 7 E 0 Inductance units henry HVsAQs LNi AI innsi4 n i meh i mm WM 9 innsi4 n i meh i mm mm m Self Inductance Question Compare the inductance of two solenoids which are identical except solenoid 2 has twice as many turns as solenoid 1 Inductance of a solenoid Flux change Ad 2 ABAcos 9 AAB Area does not change and 9 0 1 L2L1 2 L2 2 L1 N For a solenoid B Mon 07 MD U Of these only Iis variable l NCD I 2 One factor of2 for N in equation another L M solenoid factor of 2 for doubling B eld inside AI l solenoid I B A innsi4 n i u m w i m r u Him 11 innsi4 n i u m w i m r u Him 12 Energy stored in an inductor Lenz39s law says inductance opposes change in cmrent It takes time for current to build up Builds up magnetic field Stores energy as the current is setup in the inductor Energy stored Eum iLI2 Magnetic Flux Examples A conducting loop is inside a solenoid Bunl What happens to the flux throth the loop WMquot cpsBAcosrip Increase area of solenoid Nothinn Increase area ofloop Increases Increase current in solenoid Increases y Rotate IOOP Slightly Deoreosee IEIISEIA IEIISEIA Magnetic Flux Examples A solenoid Bunl is inside a conducting loop Whet happens to the ux through the loop when 15 B A cosii Increase area of solenoid Increase Increase area ofloop Nothing Increase current in solenoid Increases IEIISEIA Preflight ReVIew EMF in the rigure is sheiwn a ieieip n egge View reitating in a heinzeintai rnagnetie nei The axis at reitatiein is perpengieuiartei the page and is s EIer by the black gut in the igure The girnensiein at the ieieip perpengieuiartei the page tei the page isi The parts at the ieieip perpengieuiartei the page are mDVi g at VEquity v as snuvvri and the present instant the nurrnai tei the ieieip makes an angie at an gegrees With the El rieig Whieh at these graphs isthe eeirreet graph eir EMF vs angie7 a i PFl Flux IS decreasing PFZ EMF IS increasing mium Generators Flux is decreasing at moment shown Generators and EMF Two of the sides width w do not contribute but two with lengths L do 1 B L v sin 1 v or 9 1 cor B L sin0 e2 rw2 e elel 2cm B L sm 8 A B m sin0 eABmsinmt I IEIISEIA IEIISEIA Generators and EMF 8 mABsin0 At which time does the loop have the greatest emf 1 Hal greatest ux but 6 0 to e o 2 Part way 9 30 so as mABIZ 3 Flux is zero but 9 90 w e wAB musn4

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