Author Question: A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about ... (Read 92 times)

CQXA · **on:** Jul 27, 2018

A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of 5 10-5 T.

If the magnetic field vector points straight down, what emf is induced between the two ends of the bar?
A) 1.6 10-4 V
B) 5.6 10-3 V
C) 2.0 10-4 V
D) 7.0 10-4 V
E) 3.6 10-3 V

Question 2

The focal length of a concave mirror is 20 cm. What is its radius of curvature?

A) 10 cm
B) 40 cm
C) -40 cm
D) 20 cm
E) -20 cm