A square loop of side a and resistance R moves with speed v through distance x while remaining completely inside a uniform magnetic field B. The work done is:
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Question

A square loop of side a and resistance R moves with speed v through distance x while remaining completely inside a uniform magnetic field B. The work done is:

G1 Physics · Accepted Answer

Since the loop remains completely inside a uniform field, Φ=Ba² is constant. Therefore ε=−dΦ/dt=0, no induced current flows and there is no magnetic drag. Hence the work done is zero.