A frame CDEF is placed in a region where a magnetic field B→ is present. A rod of length one metre moves with constant velocity 20 m/s and strength of magnetic field is one tesla. The power spent in the process is (take R=0.2 Ω and all other wires and rod have zero resistance)

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1 kW

2 kW

3 kW

4 kW

answer is B.

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Detailed Solution

e=BlvRPower=e2R=B2l2v2R=l2l2×2020.2=4002=2000W=2KW

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