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Magnetic field B on the axis of a circul...

Magnetic field B on the axis of a circular coil and far away distance x from the centre of the coil are related as:

A

`B prop x ^(-3)`

B

`B prop x ^(-2)`

C

`B prop x ^(-1)`

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
A
`B = ( mu _(0))/( 4i ) (2 n l A)/(x ^(3)) implies B prop x ^(-3).`
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