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Q.

A ring of radius ‘r’ is uniformaly charged with a charge ‘q’. if the ring is rotated about its own axis with an angular frequency $' ω'$ then the magnetic induction field at the centre is

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a

$\frac{μ_{0}}{4 π} (\frac{r}{q ω})$

b

$\frac{μ_{0}}{4 π} (\frac{ω}{q r})$

c

$\frac{μ_{0}}{4 π} (\frac{q}{r ω})$

d

$\frac{μ_{0}}{4 π} (\frac{q ω}{r})$

answer is A.

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