A coil of 160 turns and area 0.20 m² is placed with its axis parallel to a magnetic field of initial magnitude 0.40 T. The magnetic field changes uniformly from 0.40 T in the +x direction to 0.40 T in the -x direction in 2.0 s. If the resistance of the coil is 16 Ω, at what rate is power generated in the coil? A) 5.0 W B) 10 W C) 15 W D) 20 W E) 25 W

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Quizplus · Accepted Answer

The change in magnetic flux induces an emf, calculated using Faraday's law. The change in flux is 2 * 0.40 T * 0.20 m² = 0.16 Wb. The induced emf is (160 turns * 0.16 Wb) / 2 s = 12.8 V. The power generated is (12.8 V)² / 16 Ω = 10.24 W, approximately 10 W.

A Coil of 160 Turns and Area 0