REY MAR AQUINO 22

An electric field is most directly related to:

• the force acting on a test charge

• the momentum of a test charge

• the potential energy of a test charge

• the kinetic energy of a test charge

• the charge carried by a test charge

As used in the definition of electric field, a “test charge”:

• none of the above

• has zero charge

• has charge of magnitude 1 C

• has charge of magnitude 1.6 × 10−19 C

• must be an electron

Experimenter A uses a test charge q0 and experimenter B uses a test charge −2q0 to measure an electric field produced by stationary charges. A finds a field that is:

• the same in both magnitude and direction as the field found by B

• less in magnitude than the field found by B

• greater in magnitude than the field found by B

• opposite in direction to the field found by B

• either greater or less than the field found by B, depending on the accelerations of the test charges

The units of the electric field are:

• N/C

• N · C2

• C/N

• N

• C/m^2

The units of the electric field are:

• J/(C·m)

• J/C

• J·C

• J/m

• none of these

Electric field lines:

• are none of the above

• are trajectories of a test charge

• are vectors in the direction of the electric field

• form closed loops

• cross each other in the region between two point charges

Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated

charged point particle. The ratio of the number of field lines through the larger sphere to the

number through the smaller is:

• 1

• 2

• 4

• 1/2

• 1/4

A certain physics textbook shows a region of space in which two electric field lines cross each other. We conclude that:

• at least two point charges are present

• an electrical conductor is present

• an insulator is present

• the field points in two directions at the same place

• the author made a mistake

Choose the correct statement concerning electric field lines:

• field lines may cross

• field lines are close together where the field is large

• field lines point away from a negatively charged particle

• a charged point particle released from rest moves along a field line

• none of these are correct

Let k denote 1/4π60. The magnitude of the electric field at a distance r from an isolated point particle with charge q is:

• kq/r

• kr/q

• kq/r^3

• kq/r^2

• kq2/r^2