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PhysicsNEET 2024Faraday's and Lenz's laws

Electromagnetic Induction

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

Question 30 as printed in the NEET 2024 booklet

  1. A.BA and CD
  2. B.AB and CD
  3. C.BA and DC
  4. D.AB and DC✓

Solution

By Lenz's law each solenoid opposes the motion. Solenoid-1 sees the magnet's N pole receding, so its near end (B) becomes an S pole to attract it; solenoid-2 sees the S pole approaching, so its near end (C) becomes an S pole to repel it. Tracing the winding sense that produces those poles gives current directions AB in solenoid-1 and DC in solenoid-2.

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