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 is a) zero b) \( 10^{-11} Nm \) c) \( 10^{-7} Nm \) d) \( 10^{-1} Nm \)
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 is a) zero b) \( 10^{-11} Nm \) c) \( 10^{-7} Nm \) d) \( 10^{-1} Nm \)
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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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