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 difference between enclosed currents, IA – IB, for the given Amperian loops is
1
\(\frac{\mathrm{N}^{2}}{2 \pi} q \omega\)
2
\(\frac{2 \pi}{\mathrm{~N}} \mathrm{q} \omega\)
3
\(\frac{\mathrm{N}}{2 \pi} \mathrm{q} \omega\)
4
\(\frac{\mathrm{N}}{\pi} \mathrm{q} \omega\)