A conducting circular loop lies in a uniform field B = 0.025 T normal to its plane. Radius decreases at a constant rate of 1 mm/s. Find the induced EMF magnitude when radius is 2 cm:
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Question

A conducting circular loop lies in a uniform field B = 0.025 T normal to its plane. Radius decreases at a constant rate of 1 mm/s. Find the induced EMF magnitude when radius is 2 cm:

G1 Physics · Accepted Answer

Step 1: Φ = Bπr². Step 2: |ε| = B|dA/dt| = B × 2πr|dr/dt|. Step 3: |ε| = 0.025 × 2π × 0.02 × 0.001 = π × 10⁻⁶ V = π μV. Correct B. Final answer: (B) π μV.