Q.

The magnetic field at the centre of a current-carrying circular coil depends on the radius R of the coil as :

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a

R

b

R2

c

1/R

d

1/R2

answer is C.

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Detailed Solution

Magnetic field due to circular wire at its center is given by μ0i2RHence magnetic field is inversely proportional to radius of coil
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The magnetic field at the centre of a current-carrying circular coil depends on the radius R of the coil as :