A 0.3 kg bar slides vertically down a set of rails at a terminal speed v while a

Question

A 0.3 kg bar slides vertically down a set of rails at a terminal speed v while a 1.24 m section of the bar is immersed in a uniform magnetic field of magnitude 0.4 T directed horizontally ( out of the page). The resistance of the bar is 0.2 Q. The rails have resistance 0.4 Ohm a) Determine v. b) In which direction does the induced current flow? Be specific and explain how you know. c) Compare, through calculation, the amount of work done on the bar by gravity to the thermal (internal) energy generated in the bar and the rails as the bar falls 0.5 m.

Explanation / Answer

a)7

b)1

c)13

0.3 M

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