A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40 $\pi $ rad s–1 about its axis, perpendicular to its plane. If the magnetic field at its centre is 3.8 × 10–9 T, then the charge carried by the ring is close to ($\mu $0 = 4$\pi $ × 10–7 N/A2 ).

Question

A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40 $\pi $ rad s^–1 about its axis, perpendicular to its plane. If the magnetic field at its centre is 3.8 × 10^–9 T, then the charge carried by the ring is close to ($\mu $₀ = 4$\pi $ × 10^–7 N/A² ).

7 × 10^–6 C

4 × 10^–5 C

2 × 10^–6 C

3 × 10^–5 C

Solution

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