A circular coil of radius 2.0cm has 500 turns in it and carries a curr – InterviewSolution

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1.

A circular coil of radius 2.0cm has 500 turns in it and carries a current of 1.0A. Its axis makes an angle of 30° with the uniform magnetic field of magnitude 0.40T that exists in the space. Find the torque acting on the coil.

Answer»

n = 500, r = 0.02m, θ = 30°

i = 1A, B = 4 × 10^–1T

i = μ × B = μB Sin30° = niABSin30°

= 500 × 1 × 3.14 × 4 × 10^–4 × 4 × 10^–1 × (1/2) = 12.56 × 10^–2 = 0.1256 ≈ 0.13N-M

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