×

×

# Define lenz's law. Description

##### Description: cheat sheet you can use for upcoming exam 2
2 Pages 119 Views 7 Unlocks
Reviews

temery11 (Rating: )

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

= K (9.9/12) + k (9:44 r.) + k (9.91 r.) We also discuss several other topics like Why productivity is so important?

Current (wo a battery): Le 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 Define nucleophile.

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

TE= - AV/[| Arcos(e)] for point charge: Vo =kQir If AV = 0 (V = constant) + E = 0 Don't forget about the age old question of How does hubble’s law relate to the distance and recession velocity of galaxies?

Faraday's Law Em = - 40. / At We also discuss several other topics like How do parties choose people in down's theory of party?

E is like a AV due to a battery Typically we ignore minus sign Lenz's Law: I must oppose its cause

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) We also discuss several other topics like What is the function of cytotoxic t-cells?

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) Don't forget about the age old question of What is a mass fatality incident?

=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  = 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

Soup

de

a

pp. of C

By Ohms Lävi! I lod: Ei

Find India

/ 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

Page Expired It looks like your free minutes have expired! Lucky for you we have all the content you need, just sign up here