Q. Two circular coils $A$ and $B$ are facing each other as shown in figure. When the current $i$ through $A$ is altered
A) There will be repulsion between $A$ and $B$ if $i$ is increased
B) There will be attraction between $A$ and $B$ if $i$ is increased
C) There will be neither attraction nor repulsion when $i$ is changed
D) Attraction or repulsion between $A$ and $B$ depends on the direction of current. It does not depend whether the current is increased or decreased
Explanation
(a) With rise in current in coil $A$ flux through $B$ increases. According to Lenz’s law repulsion occurs between $A$ and $B$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.