A straight wire 0.25 m long carries a current of 4.0 A at right angles to a uniform magnetic field of 0.60 T. What force acts on the wire?
Correct answer C. 0.60 N
Explanation
F = BIL sin 90° = 0.60 T × 4.0 A × 0.25 m = 0.60 N. Leaving out the length gives BI = 2.4 N, which has the wrong unit.
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