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A rod 0.5 m long moves at 4 m/s at right angles to a 0.2 T field and its own length. What emf appears across it?
A0.1 V
B0.8 V
C0.4 V
D4.0 V
Answer & Solution
Correct answer: C. 0.4 V
Motional emf is B times l times v, which is 0.2 x 0.5 x 4 = 0.4 V.
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