Multiple choice

How can the polarity of an electromagnet be changed?

  1. By changing the number of coils

  2. By changing the intensity of current

  3. By changing the direction of current

  4. By changing the length of the core

  5. -

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer. Polarity of an electromagnet can be changed by changing the direction of current.