A 10 cm wire lies at right angles to a uniform magnetic field of 0.5 Wb/m², and the force on it is 5 N. What current flows in the wire?
Correct answer B. 100 A
Explanation
Using F = BIL, the current is I = F/(BL) = 5 ÷ (0.5 × 0.1) = 100 A.
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