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iii) A circular loop of area \( \pi cm ^{2} \) and carrying current \( 10 \mu A \) is placed in magnetic field \( B \) with its plane perpendicular to \( B \). If \( B=\pi mT \), the magnitude of torque exerted on this loop isa) zerob) \( 10^{-11} Nm \)c) \( 10^{-7} Nm \)d) \( 10^{-1} Nm \) |
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Answer» Answer is (a) 0 Given area A = π cm2 i = 10 μA B = π mT θ = 0 We know that magnitude of torque τ = N i A B sin θ τ = 1 x 10 x 10-6 x π x 10-4 x π x sin 0° τ = 0 (∵ sin θ = 0) |
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