3 questions only

only 3 questions quiz. physics 3 covers 3 chapters.

1. A positive charge moving horizontally to the right. As it enters a region with uniform magnetic field, which is directed upward, the charge deviates
a. Upward;

B. Downward;

C. Outward;

D. Inward;

E. It will not deviate because the magnetic field is uniform.

2. A long straight wire carries a current creating magnetic field. A positive charge is moving parallel to the wire with the direction opposite to the current. The force exerted by the magnetic field on the charge is directed:

A. Parallel to the wire, the same direction as the current;

B. Parallel to the wire, direction opposite to the current;

C. Perpendicular to the wire, toward it;

D. Perpendicular to the wire, away from it;

E. There is no magnetic force at this configuration.

3. A circular conducting loop is lying on the desk in the area with the uniform magnetic field directed downward. If magnitude of the magnetic field is decreasing in time, the induced current:

A. Is directed clockwise;

B. Is directed counterclockwise;

C. Current is not induced because the loop doesn’t move;

D. Since the magnitude of the magnetic field is not given, we cannot determine the current direction;

E. Since the area of the loop is not given, we cannot determine the current direction;

F. D and E.