1. As used in the definition of electric field, a "test charge":
A. has zero charge
B. has charge of magnitude 1 C
C. has charge of magnitude 1.6 1019 C
D. must be an electron
E. none of the above

2. Electric field lines:
A. are trajectories of a test charge
B. are vectors in the direction of the electric field
C. form closed loops
D. cross each other in the region between two point charges
E. are none of the above


The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z). Then:

A. Y is negative and Z is positive
B. the magnitude of the electric field is the same everywhere
C. the electric field is strongest midway between Y and Z
D. a small negatively charged body placed at X would be pushed to the right
E. Y and Z must have the same sign

4. The magnitude of the force of a 400-N/C electric field on a 0.02-C point charge is:
A. 8.0 N
B. 8 105 N
C. 8 103 N
D. 0.08 N
E. 2 1011 N


The diagrams show four possible orientations of an electric dipole in a uniform electric field, E. Rank them according to the magnitude of the torque exerted on the dipole by the field, least to greatest.

A. 1, 2, 3, 4
B. 4, 3, 2, 1
C. 1, 2, 4, 3
D. 3, 2 and 4 tie, then 1
E. 1, 2 and 4 tie, then 3

6. The force exerted by a uniform electric field on a dipole is:
A. parallel to the dipole moment
B. perpendicular to the dipole moment
C. parallel to the electric field
D. perpendicular to the electric field
E. none of the above

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