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Physics > Physics Exam 3 > Flashcards

Physics Exam 3 Flashcards

1
Q

electric current is defined as

A
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2
Q

current is related to current density by

A

J= same direction as positive velocity charges

dA= vector perpendicular to area dA

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3
Q

Positive charge carriers acquire a drift speed Vd in the direction of the electric field, equation given by:

A

ne= charge carrier density.

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4
Q

The Resistance of a conductor is given by

A
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5
Q

Equations involving resistivity and conductivity

A
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6
Q

The Resistance R of a conducting wire of length L and uniform cross section is

A
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7
Q

resistivity variation with temperature

A
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8
Q

Ohm’s Law

A

is an assertion that the current through a device is always directly proportional to the potential difference applied to the device.

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9
Q

Equation for drift speed

A
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10
Q

the rate of electrical energy transfer

A
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11
Q

emf in terms of work

A

the emf of an emf device is the work per unit charge that the device does in moving charge from its low-potential terminal to its high-potential terminal. The SI unit for emf is the joule per coulomb

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12
Q

What determines the direction of the current in a battery?

A

The actual direction of the current in the circuit is determined by the battery with the larger emf

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13
Q

What is the loop rule

A

The algebraic sum of the changes in potential encountered in a complete traversal of any loop of a circuit must be zero.

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14
Q

What is the resistance rule?

A

For a move through a resistance in the direction of the current, the change in potential is -iR; in the opposite direction it is +iR.

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15
Q

What is the EMF rule?

A
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16
Q

What is the rule for resistors in series?

A

When a potential difference V is applied across resistances connected in series, the resistances have identical currents i. The sum of the potential differences across the resistances is equal to the applied potential difference V. (ser-i)

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17
Q

potential difference

A
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18
Q

Current in a circuit

A
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19
Q

To find the potential between any two points in a circuit

A

start at one point and traverse the circuit to the other point, following any path, and add algebraically the changes in potential you encounter.

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20
Q
A
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21
Q

Potential Difference across a real battery

A
22
Q

Electric Field is in the direction

A

of plus to minus

23
Q

Power of an EMF device

A
24
Q

sign of potential when crossing a current

sign of potential when crossing a battery

A

When you cross a resistor in the same direction as the current, that’s also a drop in potential so it’s a negative change in potential. Crossing a resistor in the opposite direction as the current gives you a positive change in potential.

When you cross a battery from the - side to the + side, that’s a positive change. Going the other way gives you a drop in potential, so that’s a negative change.

25
Q

Resistors in Parallel

A
26
Q

Discharging a Capacitor

A
27
Q

Potential difference across a capacitor during the charging process

A
28
Q

Force due to magnetic field equals

A
29
Q

Units for magnetic field

A
30
Q

right hand rule for magnetic fields

A
31
Q

equation relating charge, voltage, and capacitance

A

Q=CV

32
Q

Relating force of magnetic field to circular motion

A
33
Q

Hall potential difference

A
34
Q

Electrons flow in a direction ____ to the current

A

opposite

35
Q

Magnetic force on a current-carrying wire

A
36
Q

magnetic field due to a current in a long straight wire

A
37
Q

Ampere’s Law

A
38
Q

magnetic field at center of circular arc

A
39
Q
A
40
Q

force between two parallel currents

A
41
Q

Magnetic field of an ideal solenoid

A
42
Q

magnetic field of a toroid

A
43
Q

What is the equation for magnetic flux?

A
44
Q

What is the equation that relates magnetic flux to emf?

A
45
Q

What is Lenz’s law?

A

Lenz’s law says that an induced magnetic field and current are created to resist change in an existing magnetic field

46
Q

Equation for the current in a moving loop

A
47
Q

What is the equation for power in a moving loop?

A
48
Q

Faraday’s Law relating Electric and magnetic fields

A
49
Q

What is the equation for inductance?

A
50
Q

What is the equation for inductance of a solenoid?

A
51
Q

Equation for emf of a self-induced emf in a conductor

A
52
Q

What is the equation for an RL circuit?

A

Physics (4 decks)

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