Question

A 8.00-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.330 Ω . Pulling the wire at a steady speed of 4.00 m/s causes 4.50 W of power to be dissipated in the circuit.

How big is the pulling force?

Answer 1

L = 8.00-cm = 0.08 m

R = 0.330 Ω

v = 4.00 m/s

P = 4.50 W

the pulling force