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NEET2024Physics
Q.

In the diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:

  1. A

    AB and CD

  2. B

    BA and DC

  3. C

    AB and DC

  4. D

    BA and CD

Solution

By Lenz's law, the induced current opposes the change in flux.

Solenoid-1 sees the magnet receding (flux decreasing), so it tries to attract the magnet back: the face nearer the magnet becomes a south pole, requiring current AB (as per the figure's loop sense).

Solenoid-2 sees the magnet approaching (flux increasing); it tries to repel: the face nearer the magnet becomes a north pole, requiring current DC.

Hence AB and DC.

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