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  4. A circular loop of radius 5 cm carries an electric current. Let P and Q be two points, on the axis of the loop at distance 1 m and 2 m respectively from the center. If the magnetic field at P due to the current is 16mT, that at Q will be about

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Q. A circular loop of radius 5 cm carries an electric current. Let P and Q be two points, on the axis of the loop at distance 1 m and 2 m respectively from the center. If the magnetic field at P due to the current is 16mT, that at Q will be about

Moving Charges and Magnetism

Solution:

$B=\frac{\mu_0\,nir^2}{2(r^2 +x^2)^{3/2}}$