Q. An aluminium ring $B$ faces an electromagnet $A$. The current $I$ through $A$ can be altered
A) Whether $I$ increases or decreases, $B$ will not experience any force
B) If $I$ decreases $A$ will attract $B$
C) If $I$ increases, $A$ will attract $B$
D) If $I$ increases, $A$ will repel $B$
Explanation
(d) If current through $A$ increases, magnetic field $( \times )$ linked with coil $B$ increases. Hence anticlockwise current induces in coil $B$. As shown in figure both the currents produce repulsive effect
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.