Question:
A 50 -turn circular coil of radius $2.0 \mathrm{~cm}$ carrying a current of $5.0 \mathrm{~A}$ is rotated in a magnetic field of strength $0.20 \mathrm{~T}$.
(a) What is the maximum torque that acts on the coil?
(b) In a particular position of the coil, the torque acting on it is half of this maximum. What is the angle between the magnetic field and the plane of the coil?
Solution:
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