An 800-turn coil of effective area 0.05 m² is initially perpendicular to a uniform field B = 5 × 10⁻⁵ T. Its plane is rotated through 90° about an in-plane axis in 0.1 s. Average induced EMF is:
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Question

An 800-turn coil of effective area 0.05 m² is initially perpendicular to a uniform field B = 5 × 10⁻⁵ T. Its plane is rotated through 90° about an in-plane axis in 0.1 s. Average induced EMF is:

Options

G1 Physics · Accepted Answer

Step 1: Initial flux linkage NΦᵢ = NBA = 800 × 5 × 10⁻⁵ × 0.05 = 0.002 Wb-turn. Step 2: Final flux linkage after 90° rotation is zero. Step 3: Average |ε| = |Δ(NΦ)|/Δt = 0.002/0.1 = 0.02 V (option C). Final answer: (C) 0.02 V.