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Physics 115 - Midterm 1 > Midterm 1 > Flashcards

Midterm 1 Flashcards

1
Q

When a positive rod is brought to a neutral conductor, what happens to the charges inside the conductor?

A

Negative charges are attracted to the rod and positive are repelled

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2
Q

Will distance traveled by electrons and protons be the same if all variables are constant and equal?

A

Yes

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3
Q

What direction does an electric field above a sphere point if the charge is positive?

A

Away from the center

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4
Q

In a conductor, where do charges reside?

A

On the surface

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5
Q

What direction does electric field lines point?

A

Towards negative

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6
Q

What is dielectric?

A

Tiny K

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7
Q

How does distance impact voltages?

A

Small distance = greater voltage

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8
Q

Can a conductor transfer charges to an insulator?

A

Yes

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9
Q

How does a conductor reach electrostatic equilibrium?

A

Excess charges quickly redistribute themselves over the conductors surface

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10
Q

How are charges transferred between objects?

A

Contact

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11
Q

What is zero net charge?

A

Equal number of electrons and protons

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12
Q

What does polarize mean?

A

Divide

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13
Q

Is the polarization force between a neutral and charged object attractive or repulsive?

A

Attractive

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14
Q

What is electric force?

A

Magnitude and direction between charges

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15
Q

How do you calculate net electric force?

A

Find the sum of all the individual forces due to the charge

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16
Q

How do you find the individual force from a charge?

A

Coulomb’s Law

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17
Q

What creates an electric field?

A

Source charges

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18
Q

What does the direction of an electric field depend on?

A

Source charges

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19
Q

What direction does an electric field point?

A

Away from positive and towards negative

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20
Q

Electric field 0: If magnitude is 4 times greater, how much greater does distance need to be?

A

2 times

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21
Q

What is a parallel plate capacitor?

A

2 equally charged electrode conductors with opposite charges

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22
Q

What is an electric dipole?

A

2 charges of equal magnitude but opposite charge

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23
Q

What is the total charge of an electric dipole?

A

0

24
Q

What do closer electric field lines indicate?

A

Stronger electric field

25
Q

When is the electric field inside a conductor 0?

A

In electrostatic equilibrium

26
Q

Where do excess charges lie in a conductor?

A

The surface

27
Q

Where in a conductor is the electric field perpendicular?

A

The surface

28
Q

Does a sharp point of a conductor have a stronger or weaker electric field?

A

Stronger

29
Q

Do charges like to be close or far apart?

A

Far apart

30
Q

What is an electric dipole moment?

A

Vector the points from negative to positive charge of a dipole

31
Q

Does a dipole moment try to align itself with the electric field?

A

Yes

32
Q

Change in electric potential energy + change in kinetic energy = ?

A

0

33
Q

W = ?

A

Change in electric potential energy

34
Q

Are electric force and electric field scalar or vector quantities?

A

Vector

35
Q

Are electric potential energy and electric potential vector or scalar quantities?

A

Scalar

36
Q

How is a potential difference created?

A

By separating + charges from - charges

37
Q

Change in kinetic energy = ?

A

Negative change in electric potential energy AND negative q x change in potential energy

38
Q

Equipotential line/surfaces have the same _____ at every point

A

Potential energy

39
Q

Is the electric potential the same inside and outside of a sphere when r>R?

A

Yes

39
Q

Is the electric potential the same inside and outside of a sphere when r>R?

A

Yes

40
Q

Is the electric field at a point parallel or perpendicular to the equipotential surface at that point?

A

Perpendicular

41
Q

If change in kinetic energy increases, _____ decreases

A

Change in electric potential energy

42
Q

Electric field points from ____ potential to ______ potential

A

Higher, lower

43
Q

When do multiple conductors have the same potential energy?

A

When touching

44
Q

What does capacitance depend on?

A

Shape, size, and spacing of the 2 electrodes

45
Q

Does distance effect the electric field in a capacitor?

A

No

46
Q

What is C knot

A

Capacitance without any dielectric

47
Q

When capacitance increases, change in potential energy _____

A

Decreases

48
Q

What is current?

A

Flow rate of positive charge

49
Q

Does a charge gain or lose electric potential energy as it moves from the negative side of the battery to the positive?

A

Gain

50
Q

Junction Law

A

Sum of the currents in must equal sum of the currents out

51
Q

Loop Law

A

Net change of potential energy in any loop must be 0

52
Q

Is the potential difference across bulbs in parallel equal?

A

Yes

53
Q

Is the potential difference across bulbs in series equal?

A

No

54
Q

Is the current across bulbs in parallel equal?

A

No

55
Q

When is work positive?

A

When it’s in the same direction as the displacement

Physics 115 - Midterm 1 (1 decks)

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