A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40π rad/s 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 (μ0 =4π × 0-7 N/A2)

A thin ring of 10 cm radius carries a uniformly distributed charge. Th

1.	A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40π rad/s 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 (μ0 =4π × 0-7 N/A2)
A.	2 × 10-6 C
B.	3 × 10-5 C
C.	4 × 10-5 C
D.	7 × 10-6 C
Answer» C. 4 × 10-5 C

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A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40π rad/s 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 (μ0 =4π × 0-7 N/A2)

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