N equally spaced charges each of value q, are placed on a circle of radius R. The circle rotates about its axis with an angular velocity ω as shown…

N equally spaced charges each of value q, are placed on a circle of radius R. The circle rotates about its axis with an angular velocity $\displaystyle \omega$ as shown in the figure. A bigger Amperian loop B encloses the whole circle where as a smaller Amperian loop A encloses a small segment. The difference between enclosed currents, $\displaystyle \mathrm{I}_{\mathrm{A}}-\mathrm{I}_{\mathrm{B}}$, for the given Amperian loops is