A thin ring of radius r meter has charge q uniformly spread on it. The ring rotate
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A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions/s. The value of magnetic induction in Wb/m² at the centre of the ring is
Options
(a) µ₀q f / 2π R
(b) µ₀q / 2π f R
(c) µ₀q / 2 f R
(d) µ₀q f / 2 R
Correct Answer:
µ₀q f / 2 R
Options
(a) µ₀q f / 2π R
(b) µ₀q / 2π f R
(c) µ₀q / 2 f R
(d) µ₀q f / 2 R
Correct Answer:
µ₀q f / 2 R
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Explanation: ANSWER: u0qf/2R
B=u0i/2R
since i=q/t and f is the frequency for the revolution per second
so i=qf (as f=1/t)
hence B=u0qf/2R....
hope it helps
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