List of top Physics Questions on Amperes circuital law asked in KEAM

The line integral of the magnetic field around a closed loop is directly proportional to the ________.

A long straight wire of radius $R$ carries a steady current, $I_0$, uniformly distributed throughout the cross-section of the wire. The magnetic field at a radial distance $r$ from the center of the wire, in the region $r > R$, is