An electromagnet is a magnet when current is passed through a wire wound on soft iron core. It gets magnetized and behaves like magnet. One such example of electromagnet is a solenoid.
1. What material is used inside the solenoid?
a. Soft iron core
b. Hard iron core
c. Soft steel core
d. Hard steel core
2. Why is a soft iron core used inside solenoid?
a. For high motion
b. For low motion
c. For high magnetism
d. For low magnetism
3. What are solenoids used for?
a. Making jewellery
b. Making electromagnets
c. Making tools
d. Making gadgets
4. What happens to the soft iron when current is switched off?
a. It becomes insulating
b. It becomes conducting
c. It gains magnetism
d. It loses its magnetism
5. Why is steel not used in a solenoid?
a. It will not lose its softness when current is switched off
b. It will lose its magnetism when current is switched off
c. It will not lose its magnetism when current is switched off
d. It will not lose its hardness when current is switched off
