Three identical coils $C_1, C_2$ and $C_3$ are closely placed such that they share a common axis. $C

Question

Three identical coils $C_1, C_2$ and $C_3$ are closely placed such that they share a common axis. $C_2$ is exactly midway. $C_1$ carries current $I$ in anti-clockwise direction while $C_3$ carries current $I$ in clockwise direction. An induced current flows through $C_2$ will be in clockwise direction when

Professor PC Thomas Classes · Answer

According to Lenz's Law, the induced current in $C_2$ will oppose the change in magnetic flux. $C_1$ has an anti-clockwise current (acts as a North pole) and $C_3$ has a clockwise current (acts as a South pole). For $C_2$ to have an induced clockwise current (acting as a South pole), it must either be repelling a South pole moving towards it (which $C_3$ isn't doing in option B) or it must be attracting a South pole moving away, OR opposing a North pole moving towards it. When $C_1$ (North) moves towards $C_2$, $C_2$ induces a clockwise current to oppose the approaching North pole.