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?

• A. Increase the number of circular turns of solenoid.
• B. Reverse the direction of current in solenoid.
• C. Decrease the magnitude of current in solenoid.
• D. Placing a soft iron inside the solenoid.

Answer 1

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

$\mathrm{The\; force\; of\; attraction\; depends\; on\; the\; magnetic\; strength\; of\; the\; solenoid.\; The\; magnetic\; strength\; of\; the\; solenoid\; can\; be\; reduced\; by\; decreasing\; the\; electric\; current\; flowing\; through\; it.}$