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The radius and number of turns of a circ...

The radius and number of turns of a circular coil are doubled. The magnetic intensity at its centre will be

A

one fourth

B

foru times

C

double

D

no change

Text Solution

Verified by Experts

The correct Answer is:
D
`a_2=2a_(1),n_2=2n_(1),B_(2)=?`
`Bprop (n)/(a)`
`(B_2)/(B_1)=(n_2)/(n_1)xx(a_1)/(a_2)=(2n_1)/(n_1)xx(a_1)/(2a_1)`
`therefore B_2=B_1`
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