A non-conducting ring of radius R has charge Q distributed unevenly over it- If it rotates with an angular velocity - the equivalent resistance between parallel faces isA- -2 -B- Q-C- ZeroD- Q 2 -

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Electromagnetic Induction

A non-conduct...

Question

A non-conducting ring of radius R has charge Q distributed unevenly over it. If it rotates with an angular velocity ω, the equivalent resistance between parallel faces is

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Solution

The correct option is A

Question involves very basic concept saying current is rate of flow of charge.
With each rotation, charge Q crosses any fixed point P near the ring.
Number of rotations per second $= \frac{ω}{2 \prod}$
Therefore, charge crossing P per second = current $= Q \frac{ω}{2 \prod}$

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A non-conducting ring of radius R has charge Q distributed unevenly over it. If it rotates with an angular velocity ω, the equivalent resistance between parallel faces is

The correct option is A Question involves very basic concept saying current is rate of flow of charge. With each rotation, charge Q crosses any fixed point P near the ring. Number of rotations per second =ω2∏ Therefore, charge crossing P per second = current =Qω2∏