AP EAMCET · PHYSICS · Magnetic Effects of Current
A circular coil of radius \(9 \mathrm{~cm}\) carrying a current of \(2 \mathrm{~A}\) is free to rotate about an axis in its plane perpendicular to an external magnetic field of \(\pi \times 10^{-2} \mathrm{~T}\). When the coil is turned slightly and released, it oscillates about its stable equilibrium with a time period of \(\frac{1}{3} \mathrm{~s}\). If the moment of inertia of the coil about its axis of rotation is \(9 \times 10^{-5} \mathrm{kgm}^2\), the number of turns of the coil is ____
- A \(10\)
- B \(20\)
- C \(30\)
- D \(40\)
Answer & Solution
Correct Answer
(B) \(20\)
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