Q. Two circular coils mounted parallel to each other on the same axis carry steady currents. If an observer between the coils reports that one coil is carrying a clockwise current $i_{1}$, while the other is carrying a counter clockwise current $i_{2}$, between the two coils, then there is

A) A steady repulsive force
B) Zero force
C) A repulsive force
D) A steady attractive force
Explanation

(d) The coil carrying current $i,\ $in clockwise coil have South polarity on that face of coil and other coil having current $i_{2}$ in counter clockwise will have North polarity on that face of coil. As south and north poles will attract each other, hence a steady attractive force acts between coils.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.