A metal bar of length L = 0.51 m slides freely on two frictionless, horizontal m

Question

A metal bar of length L = 0.51 m slides freely on two frictionless, horizontal metal rails as shown in the figure below. The entire circuit has resistance R = 265 ?. A magnetic field B = 1.2 T is directed upward, perpendicular to the plane of the drawing and the rectangular area enclosed by the bars. An external force is applied to the bar such that it moves to the right with speed v = 24 m/s. What are the magnitude and direction of the current induced in the bar?

magnitude     ? A direction     clockwise or counterclockwise A metal bar of length L = 0.51 m slides freely on two frictionless, horizontal metal rails as shown in the figure below. The entire circuit has resistance R = 265 ?. A magnetic field B = 1.2 T is directed upward, perpendicular to the plane of the drawing and the rectangular area enclosed by the bars. An external force is applied to the bar such that it moves to the right with speed v = 24 m/s. What are the magnitude and direction of the current induced in the bar? magnitude ? A direction clockwise or counterclockwise

Explanation / Answer

emf = e = B*v*L

current i = e/R = B*v*L/R

i = (1.2*24*0.51)/265

i = 0.055 A

clockwise

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