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Q.

A ring of radius R has uniformly distributed charge .It spins about its axis with an angular velocity ω.P is a point on its axis at a distance x from its centre. The velocity of light in vacuum is c. The ratio of the magnetic field to the electric field at P is proportional to

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a

R2

b

1/x

c

1/c2

d

ω

answer is A, B, C, D.

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Detailed Solution

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B=μ0qω2π×R22R2+x23/2 and E=kqxR2+x23/2

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