Teaching NVS TGT 2024 Test Series Physics Electromagnetic Induction and Inductance Faraday’s Law of Induction
Which of the following statements is true about an electromagnet?
1
The polarity of an electromagnet cannot be changed.
2
An electromagnet produces a comparatively weak force of attraction.
3
The strength of an electromagnet can be changed by changing the number of turns in its coil.
4
An electromagnet is permanent magnet.