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A 100-turn coil of area 0.01 m^2 carries 0.5 A, with its plane parallel to a 0.4 T field. What is the torque?
A0.2 N m
B0.4 N m
C0.02 N m
D2 N m
Answer & Solution
Correct answer: A. 0.2 N m
With the plane parallel to B the torque is maximum: NIAB = 100 x 0.5 x 0.01 x 0.4 = 0.2 N m.
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