Question

The strength of an electromagnet is

• A. directly proportional to the number of turns per unit length of the coil.
• B. inversely proportional to the number of turns per unit length of the coil.
• C. inversely proportional to the amount of current flowing through the coil.

Answer 1

The correct option is A

directly proportional to the number of turns per unit length of the coil.

Electromagnet:

An electromagnet is made up of a soft iron core insulated by copper wire. It behaves like a magnet when current is passed through it and loses its magnetism when current is stopped.

The explanation for the correct option:

1. The greater the number of turns in the electromagnet more is the induced magnetic field.
2. Also as the current increases the strength of the magnetic field across the solenoid increases.
3. Thus, The strength of an electromagnet is directly proportional to the number of turns per unit length of the coil.

Hence option A is the correct answer.