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The field normal to the plane of a wire ...

The field normal to the plane of a wire of 15 turns and radius r which carries 1 A is measured on the axis of the coil at a small distance d from the centre of the coil. This is smaller than the field at the centre by the fraction

A

`3/2 d^(2)/r^(2)`

B

`2/3 d^(2)/r^(2)`

C

`3/2 r^(2)/d^(2)`

D

`2/3 r^(2)/d^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
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