What happens when C_1 and C_2 are moved away from each other along th…

The correct answer is Option (1) → A current is induced in \( C_1 \), opposite in direction to the current induced when the coils approach each other

By Faraday’s law, a current is induced in \( C_1 \) only while the magnetic flux through it changes. By Lenz’s law, the induced current always opposes that change.

Option (1) A current is induced in \( C_1 \), opposite in direction to the current induced when the coils approach each other — Correct. Moving the coils apart decreases the flux of \( C_2 \) through \( C_1 \), while bringing them together increases it. The induced current opposes each change, so the two currents flow in opposite directions.

Option (2) A current is induced in \( C_1 \), in the same direction as when the coils approach each other — Incorrect. The same direction would need the flux through \( C_1 \) to change in the same sense both times. But the flux increases on approach and decreases on separation.

Option (3) No current flows at all — Incorrect. The coils are in relative motion, so the flux through \( C_1 \) changes and an emf is induced. A current flows while the motion lasts.

Option (4) The galvanometer keeps a steady deflection even after the coils stop — Incorrect. Once the coils stop, the flux through \( C_1 \) is constant, the induced emf is zero and the pointer returns to zero.

NCERT (2026-27):
The Experiments of Faraday and Henry – “… The steady current in the coil C₂ produces a steady magnetic field. As coil C₂ is moved towards the coil C₁, the galvanometer shows a deflection. This indicates that electric current is induced in coil C₁. When C₂ is moved away, the galvanometer shows a deflection again, but this time in the opposite direction. The deflection lasts as long as coil C₂ is in motion. When the coil C₂ is held fixed and C₁ is moved, the same effects are observed.”