Physics
State two advantages of an electromagnet over a permanent magnet.
Magnetism
65 Likes
Answer
Advantages of an electromagnet over a permanent magnet are —
- An electromagnet can produce a strong magnetic field.
- The strength of the magnetic field of an electromagnet can easily be changed by changing the current (or the number of turns) in it's solenoid.
Answered By
44 Likes
Related Questions
State two ways through which the strength of an electromagnet can be increased.
Figure shows a coil wound around a soft iron bar XY. (a) State the polarity at the end X and Y as the switch is pressed. (b) Suggest one way of increasing the strength of the electromagnet so formed.
How is the working of an electric bell affected, if alternating current is used instead of direct current?
Name the material used for making the armature of an electric bell. Give a reason for your answer.