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Most Important Selected Qs for JEE AdvancedPhysicsMagnetic Effects of Current

Two hollow-core solenoids, A and B, are connected by a wire and separated by a large distance, as shown in the diagram. Two bar magnets, 1 and 2, are suspended just above the solenoids. If the magnet 1 is dropped through solenoid A as shown, then the magnet 2 will simultaneously be

Options

  1. AAttracted by a magnetic force towards solenoid B
  2. BRepelled by a magnetic force away from solenoid B
  3. CRepelled by an electric force away from solenoid B
  4. DUnaffected by solenoid B.

Correct answer

A. Attracted by a magnetic force towards solenoid B

Step-by-step solution

As the magnet- 1 falls into solenoid A , the magnetic flux associated with solenoid A increases. From Lenz's law, induced current in solenoid A will oppose this increase in magnetic flux. Hence direction of induced current in solenoids is as shown. The nature of magnetic field produced by solenoid B is as shown. Therefore magnet 2 will be attracted by magnetic field due to solenoid B .

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