Question

A. What is an electromagnet?

B. In an electromagnet, what is the advantage of soft iron
core?
C. How can we increase the strength of an electromagnet?

D. What will happen if the current passing through the coil is
switched off?

Answer 1

A. A strong magnetic field produced inside a solenoid can be used to magnetise a piece of magnetic material, like a soft iron core. The magnet this obtained is an electromagnet.

B. A soft iron core makes the magnetic field stronger as it acts as a temporary magnet itself.

C. Increasing the current

Adding more turns to the coil

Using a soft iron core

D. If the current is switched off, the electromagnet will stop working