A nonconducting ring of radius R has charge Q distributed unevenly ove

1.	A nonconducting ring of radius R has charge Q distributed unevenly over it. If it rotates with an angular velocity ω, the equivalent current will be (a) zero (b) Qω(c) Q (ω/2π)(d) Q (ω/2πR)
Answer» Correct Answer is: (c) Q ω/2π With each rotation, charge Q crosses any fixed point P near the ring. Number of rotations per second = ω/2π. ∴ charge crossing P per second = current = Qω/2π.

A nonconducting ring of radius R has charge Q distributed unevenly over it. If it rotates with an angular velocity ω, the equivalent current will be (a) zero (b) Qω(c) Q (ω/2π)(d) Q (ω/2πR)

Answer»

Correct Answer is: (c) Q ω/2π

With each rotation, charge Q crosses any fixed point P near the ring. Number of rotations per second = ω/2π.

∴ charge crossing P per second = current = Qω/2π.