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A 50-turn coil of area 0.04 m^2 carries 0.2 A. Its magnetic moment?
A0.04 A m^2
B0.4 A m^2
C4.0 A m^2
D0.08 A m^2
Answer & Solution
Correct answer: B. 0.4 A m^2
m = N I A = 50 × 0.2 × 0.04 = 0.4 A m^2.
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