Author Question: A conducting bar slides without friction on two parallel horizontal rails 50 cm apart. The ... (Read 89 times)

haleyc112 · **on:** Jul 29, 2018

A conducting bar slides without friction on two parallel horizontal rails 50 cm apart. The resistance of the bar and the rails is assumed to be constant and equal to 0.1 . A uniform magnetic field is perpendicular to the plane of the rails.

A force F = 0.08 N is required to keep the bar moving at a constant speed of 0.5 m/s. What is the magnitude of the magnetic field? A)

0.1 T
B)

0.25 T
C)

0.36 T
D)

0.54 T
E)

0.93 T

Question 2

A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 27-6.

If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil? A)

perpendicular to and into the page
B)

perpendicular to and out of the page
C)

in the direction of the magnetic field
D)

in the opposite direction of the magnetic field
E)

none