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Question

When a current of 0.5 A is passed through a solenoid, it attracts an iron piece with a force of 10 N. Which of the following could be done to reduce the force between them?
  1. Increase the number of circular turns of solenoid.
  2. Reverse the direction of current in solenoid.
  3. Decrease the magnitude of current in solenoid.
  4. Placing a soft iron inside the solenoid.


Solution

The correct option is C Decrease the magnitude of current in solenoid.

The force of attraction depends on the magnetic strength of the solenoid. The magnetic strength of the solenoid can be reduced by decreasing the electric current flowing through it.

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