An explorer walks into a lab in a science building. She has a ...

[khang]

An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material was installed in the North or South walls of the room, she would expect that
 a. the south pole of the compass would tend to point toward those walls.
  b. the north pole of the compass would tend to point toward those walls.
  c. the compass needle would not point in any particular direction.
  d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls.
  e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.

Question 2

A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = -2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
 a. 3.2 ILB
  b. 5.0 ILB
  c. 4.2 ILB
  d. 3.6 ILB
  e. 1.0 ILB

[nyrave]

Answer to Question 1

B

Answer to Question 2

D