A square loop of area 25 cm² and resistance 10 Ω is initially in a uniform magnetic field 40.0 T perpendicular to its plane. It is pulled completely out slowly and uniformly in 1.0 s. The work done is:
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Question

A square loop of area 25 cm² and resistance 10 Ω is initially in a uniform magnetic field 40.0 T perpendicular to its plane. It is pulled completely out slowly and uniformly in 1.0 s. The work done is:

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G1 Physics · Accepted Answer

Flux changes by BA=40×25×10⁻⁴=0.1 Wb in 1 s, so induced emf is 0.1 V and current is 0.01 A. Dissipated work I²Rt=(0.01)²×10×1=1.0×10⁻³ J. Hence B.