A circular coil of radius R carries an e...

A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that `r > > R`, varies as

`1/r`

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

`1/(r^2)`

`1/(r^3)`

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