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 center of the coil, such that r>>R, varies as1) 1/r2) 1/(r)^(3/2)3) 1/r^24) 1/r^3

Dear student

When
r >> R
Mgnetic field at a point on the axis of a loop is given by
B = (mu /2 * pi) (AI/ r³)
Hence
B is proportional to 1/r³
Hence Correct option is D

Approved

Dear studentWhen r >> R The magnetic field at a point on the axis of a loop is given by B = (mu /2 * pi) (AI/ r³)

Approved