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JEE Main 12 Apr 2019 Paper 1 Solved Paper

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Question : 5

Total: 90

A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40 π‌rad‌s−1 about its axis, perpendicular to its plane. If the magnetic field at its centre is 3.8×10−9T, then the charge carried by the ringis close to (µ0=4π×10−7N∕A2)

3×10−5C
2×10−6C
4×10−5C
7×10−6C

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