Question

Which of the following changes the strength of the magnetic field created by an electromagnet

• A. Amount of current flowing through it
• B. Changing the direction of current
• C. Number of turns wound on the electromagnet.
• D. None of the above

Answer 1

Answer: (A), (C)

The correct options are
A

Amount of current flowing through it

C

Number of turns wound on the electromagnet.

Strength of the magnetic field produced by a current carrying conductor depends on following factors:

1) Strength of the current: As the strength of the current flowing through the conductor increases, the strength of the magnetic field increases.
2) Number of turns in the solenoid: Larger the number of turns in the solenoid, stronger is magnetic field produced.

Hence option a and c are correct.

Changing the direction of current does not affect the strength of the magnetic field hence b) does not hold true.