Question

Two coils $P$ and $Q$ are placed co-axially and carry current $I$ and $I^{\prime }$, respectively. Then

• A. If $I^{\prime }=0$ and $P$ moves towards $Q$, a current in the same direction as $I$ is induced in $Q$.
• B. If $I=0$ and $Q$ moves towards $P$, a current opposite in direction to that of $I^{\prime }$ is induced in $P$.
• C. When $I\ne 0$ and $I^{\prime }\ne 0$ are in the same direction, then two coil tend to move apart.
• D. None of these

Answer 1

Answer: (B)

Correct answer is (b) If $I=0$ and $Q$ moves towards $P$, a current opposite in direction to that of $I^{\prime }$ is induced in $P$.