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Define lenz's law.

Define lenz's law.

Description

School: Virginia Polytechnic Institute and State University
Department: Physics
Course: General Physics II
Professor: Kriton
Term: Spring 2019
Tags: electric field, magnetic field, electricity and magnetism, electric flux, magnetic flux, resistance/ resistivity ohm's law, Faraday's Law, induction, magnetic, and forces
Cost: 50
Name: EXAM 2 CHEAT SHEET / STUDY GUIDE
Description: cheat sheet you can use for upcoming exam 2
Uploaded: 04/01/2019
2 Pages 17 Views 7 Unlocks
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EXAM 2 CHEAT SHEET


Define lenz's law.



Ch 19 - Electric Potential

Ch 22 - Electromagnetic Induction

Conservative forces review: APE = -W.. PE = mgh P E.ring = kx Fee is conservative (it has a PE)

+ We can use E-conservation! (E = E) F = k (laQ!)


What is ohm's law in simple terms?



PEcou = k (9Q/) in J if >2 point charges: PE = PE2 + PE = PES Don't forget about the age old question of Why productivity is so important?

= K (9.9/12) + k (9:44 r.) + k (9.91 r.)

Current (wo a battery): Le


What is faraday's law?



Don't forget about the age old question of What are the types of nucleophilic reactions?

B). A orientation of A w.r.t vector field

Orientation: max plane blocks 8.0° if plane slices B By construction, B = 3 + B, e: angle bw normal to sfc and B Don't forget about the age old question of What is a “standard candle” in astronomy?

B = B cose Definition: 0= B A OR 0 = |BA cose

Electric potential (V): describes an electric field (E)

Recall: F = GE [V] = J/C or Volts Av = APE /

dir of E: high V low V APE, = -9|E||Arcos(e) FriE + 1 = oonstant Don't forget about the age old question of How do parties choose people in down's theory of party?

TE= - AV/[| Arcos(e)] for point charge: Vo =kQir If AV = 0 (V = constant) + E = 0

Faraday's Law Em = - 40. / At

E is like a AV due to a battery Typically we ignore minus sign Lenz's Law: I must oppose its cause Don't forget about the age old question of B-cells make antibodies (ab) also called what?

Capacitance (Fa / Fa) C = QI AV Parallel Plate Capacitors: C = AE,/d E, = 8.85x10- CINm To increase capacitance, put dielectric b/w plates

IE, I = 1 E, / C = kc. E = ¥!(Q®/C) If you want to learn more check out What are the 4 types of mass disaster?

Lenz's Law State the change (Ac.) as precisely as possible Negate above statement to find B. (

B vs B.) Find dir of B. RHR2 for dir of Ind

Ch 21 - Magnetic Forces & Fields

Ch 20 - Electric Current

Moving charges electric current AQ/At= (1 = A(Amp) AV: sometimes denoted as Vor (electromotive force) - a battery

currents are made up of positive, moving charges

AV - IR Ris coefficient of proportionality [R] = (Ohm)

=CR goes from high V to low Y 1.-7. - AEPE I Ag P = JAV PER PER For mylindrical conductors for any sufficiently m etric shapel RapLIA p = resistivity of material L = length = cross-sectional arca wri battery

Connection of Multiple Resistor R, R, in series: R =R+R R R, in parallel 1/R = 1/R + 1/R

For more complex circuits multinle murers Kirchhoff's rules:

Junction rule = Loop rulo - SAV = 0

Charging / discharging capacitors "Around loop

- Charging: 0/0 - Cy[1.c )

FORCES Electric force: blw 2 charges ... Magnetic force: b/w 2 ourronts Cross Product AxB is a vector Definition: Ax |-|A||B sin Direction of Ax given by RHR1

Sweep right hand from A to B (to make a fist) & sce where thumb points (toward board in this)

BXAthumb points away from board (toward you)

So, AxD.

BA Notation: *. into board / page out of board / page Magnetic Force Law F-qV x B = F. I = I VI|B sin(0) Mass Spectrometer UCM F = Ft qVB = Vir r=m /qB T = 2T (m/qB) Force on a straight current carrying wire for ist straight current) in a B

F.I - qvBsin = q L / tsino F.I - BIL in Direction: RHR11 Cunt non EF = F, + F + F +F, = 0 ET = NBIA (for Ntums)

Always true! FIELDS Bu nastriot currert carrying wire

Amperc's Law BIP) = 1/2 H. = 411 10.1 TM'A [2] = T (Tesla) Use RHR2 to determine direction

L 11 Koop fingers curled, point right thumb in

dir. of current, see where curved 4 fingers point Faren bhw 2 straigh: parallel cu Tents (2 images , IF I = BI Lsine

- Find B due to at a point on wire 2

B|- v.4/2md

• Use from above to find F

IF I = (1/2 td), L Direction of F.: RHR1

Swoop qvinta Band B is painting into the board

Direction: towards I. (attractive) - Bai center?

Bal-N .1/2R

AC)

For multiple barched circuits:

Label all the currents Get one (or morc) equation(s) using

junction rule Get remaining equations using loop rule

We can choose any loop

We can go around it either CW or CCW If dir. of currents is not obvious, ok to guess If at the end a curren: comes out negative,

simply reverse the initial guess

Q(i=0) = 0 l(t) = 1, HCl(t) = (V/R] (

VIR max Discharging: @[0) = Cretik)

QI=0) = Q = CY

Close switch at t = 0 l(t) = (V/ R) (CR)

É

!

Caracters in Series & Paralel Series: 1/0 - 1/C. + 170, Paralle: C -C. + C

SENSO

3

EXAM 2 CHEAT SHEET

Ch 20 - Electric Current Useful Figures

1. All carry same current (series connection)

3. R. R in series

O AV.. - IR, IR

-WW-W

OR=R, #R

2. All subject to same AV (parallel connection)

4. R

R in parallel

• 1/R =1/R + 1/R,

wit wat

SERIES

Find Rebih dan

3

PARALLEL

parallel

Rear = Rof Real v

Ch 21 - Magnetic Forces & Fields Useful Figures

by die

R-11:

1

1 5-90. 11 .1

OV

9V

Find sign of moving charges, given trajectories and B

. Assume 9, Oir is incorrect, just pick the opposite) . F = V x B . 4, Ogives wrong Fu

la uniform

EXAM 2 CHEAT SHEET

Ch 22 - Electromagnetic Induction Useful Figures

example:

Fairforca

s Soup

Exam DIE

dy Sou

Ds of O Beat

through A decreases

Idir of

India

Find

Bind is not

Find

- Faraday's Lom

Soup

de

a

pp. of C

By Ohms Lävi! I lod: Ei

Find India

Foradays LAD

/ At

(BLAC

dir of Ind

6. By Faraday's Low: 1€ =

H is wi#) —

All Be A 205D)

DA

Lorenz LAW Lind - *+es+ W RHR2

-

Betlan

Rat

WAX

TI WE...

Butke by

Bertv

example:

Dir of Ind is CCW

dir

of

Iind?

study Soup

DR

of

Beas

through

loop

increasero

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