A wire rod rolls with a speed of 20 m/s on two metallic rails, 1.0 m apart, that form a closed loop. If the magnetic field is 1.5 T into the page, the power dissipated in the resistor R and the current direction are, respectively,
A) 33 mW, clockwise.
B) 33 mW, counterclockwise.
C) 76 mW, counterclockwise.
D) 76 mW, clockwise.
E) 50 mW, clockwise.

Question

A wire rod rolls with a speed of 20 m/s on two metallic rails, 1.0 m apart, that form a closed loop. If the magnetic field is 1.5 T into the page, the power dissipated in the resistor R and the current direction are, respectively,
A) 33 mW, clockwise. 
B) 33 mW, counterclockwise. 
C) 76 mW, counterclockwise. 
D) 76 mW, clockwise. 
E) 50 mW, clockwise.

Quizplus · Accepted Answer

The Answer of  A wire rod rolls with a speed of 20 m/s on two metallic rails, 1.0 m apart, that form a closed loop. If the magnetic field is 1.5 T into the page, the power dissipated in the resistor R and the current direction are, respectively,
A) 33 mW, clockwise. 
B) 33 mW, counterclockwise. 
C) 76 mW, counterclockwise. 
D) 76 mW, clockwise. 
E) 50 mW, clockwise.

A Wire Rod Rolls with a Speed of 20 M/s