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A circular loop of area cm2 and carrying a current of 10 μA is placed in a magnetic field with its plane parallel to (B = 15 mT). When the loop has rotated through an angle of 45°, the magnitude of the torque exerted on this loop is (A) zero (B) 15 × 10-12 N∙m(C) 15 × 10-8 N∙m (D) 15 × 10-2 N∙m |
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Answer» (B) 15 × 10-12 N∙m |
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