Q.

A wire of length 'l' is bent into a circular coil of one turn of radius R1. Another wire of the same material and same area of cross section and same length is bent into a circular coil of two turns of radius R2. When the same current flows, through the two coils, the ratio of magnetic induction at the centre is

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a

1 : 4

b

3 : 1

c

1 : 2

d

1 : 1

answer is C.

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Detailed Solution

B1B2=n1n22=n2n2=14

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