Magnetic Effects of Current and Magnetism Part 3

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 in the figure. A bigger Amperian loop B encloses the whole circle where as a smaller Amperian loop A encloses a small segment. The different enclosed currents, IA−IB, for the given Amperian loops is