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A horizontal wire is free to slide on th...

A horizontal wire is free to slide on the verticle rails of a conducting frame as shown in figure. The wire has a mass `m` and length `l` and the resistance of the circuit is `R`. If a uniform magnetic field `B` is directed perpendicular to the frame, the terminal speed of the wire as it falls under the force of gravity is

In the above problem if `m=1kg` and teminal velocity attained by its is 4m/s after falling a height of 1m, the energy dissipated as heat till then is `(g=10m//s^(2))`

A

10J

B

2J

C

epsilonJ

D

12J

Text Solution

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The correct Answer is:
B
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