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phys108 > Final Exam 108 > Flashcards

Final Exam 108 Flashcards

1
Q

Amphere’s law in words

A

Magnetic field created by an electric current

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2
Q

Amphere’s Law formula

A

Line integral Bdl =muoI (encircled)

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3
Q

2 Criteria for choosing Ampherian Loop and any explanation

A
  1. Loop needs to pass through field pt
  2. Direction of loop needs to be either ⊥ or || to B vector
    2 why-> parallel dlB=dl(B)
    perdendicular dl    B=-0
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4
Q

Solenoid B field lines

A

B field lines are parallel lines inside the solenoid

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5
Q

Lenz law

A

Dircetion of induced emf is such that the magnetic field created by the induced current opposes the change in magnetic flux

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6
Q

Magnetic flux

A

flux= double integral B*dA

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7
Q

Biot-Savart law in words

A

A current element creates a magnetic field

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8
Q

Biot-Savart

A

dB= munaught/4pi * I dl (vector) *rhat/ r^2

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9
Q

Gauss law in words

A

E-field created by a charge that enters normal to an area

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10
Q

Faraday’s law in words

A

When there is a change in flux, coil will induce an emf to oppose that change

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11
Q

Faraday’s Law of Induction

A

ε=-d(mag flux)/dt

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12
Q

What does the induced emf do?

A

Can cause a current to flow just not localize

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13
Q

Induced current according to Faraday’s law of induction

A

I induced = ε/R

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14
Q

Lorentz force

A

F= qE+qV*B

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15
Q

Hall Voltage

A

Vh=vBh

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16
Q

Generic B field created by an infinately straight current (formula and direction of field lines)

A

B=(munot*I)/(2pir)
Field lines are circles around current

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17
Q

Parallel Currents

A

Attract eachother

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18
Q

Anti-Parallel Currents

A

Repel eachother

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19
Q

Energy Stored in a inductor

A

U=0.5 LI^2

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20
Q

What faraday’s law does

A

Induced emf (electric field) created by by a changing flux which comes from a change in B field

21
Q

Electric dipole

A

p=qd

22
Q

Potential energy of electric and magentic dipole

A

dot product use cos(theta) bc results in scalar

23
Q

Lenz law

A

If flux entering a current loop, have to determine direction of current given that the b field from current will oppose flux

24
Q

R series

A

Rs= R1+R2+R3…

25
Q

R parallel

A

1/Rp= 1/r1 +1/r2 +1/r3…

26
Q

Capacitors in series

A

Cs= 1/C1 + 1/C2 +…

27
Q

Definition of resistance

A

R= resisitivty constant (Ro) L/A

28
Q

Definition of capacitance

A

C=Enaught (A/d)

29
Q

Force on a test charge

A

F=qE

30
Q

B field through a solenoid

A

munaughtnI

31
Q

Faraday’s law of induction

A

Use Ohms law
Iinduced =V/R

32
Q

Energy Storage in a capacitor

A

U= QV/2

33
Q

Period for circular motion of particle

A

T=2pim/qB

34
Q

Frequency

A

1/T=qB/2pim

35
Q

Radius for circular motion of particle

A

r= mV/qb

36
Q

Electric power (P)

dissapted through resistor

A

P=IV
P=I^2R
since V=IR

37
Q

Magnetic force on a current

A

F(vector)=I L*B (take cross product of vectors L and B

38
Q

Magnitude of velocity for particle under influence of both Fe and Fm

A

V= E/B

39
Q

Energy stored on a capacitor

A

U=Q^2/2C

40
Q

Capacitors in parallel have the same

A

Voltage (V)

41
Q

Capacitors in series have the same

A

charge (Q)

42
Q

Resistors in series

A

have the same I

43
Q

Resistors in Parallel

A

RESISTORS IN PARALLEL HAVE THE SAME VOLTAGE

44
Q

Gauss law plane

A

sigma/2epsilon

45
Q

Gauss law sphere

A

Q/4piepsilonr^2

46
Q

Gauss law cylindrical

A

E=lambda/2piepsilonr

47
Q

Current definition

A

I = qvnA

48
Q

B field of current loop

A

B=unaught*i/2R

phys108 (4 decks)

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