i. Material alnico is a mixture of aluminium, nickel and iron. ii. Magnetism of electromagnet is permanent.

Question

State whether true or false. If false, correct the statement.

i. Material alnico is a mixture of aluminium, nickel and iron.

ii. Magnetism of electromagnet is permanent.

iii. The bar of soft or pure iron protects the magnet.

iv. Like poles attract each other and unlike poles repel each other.

v. The magnetic force is concentrated at the centre of the magnet.

Answer 1

i. False: Material alnico is a mixture ofaluminium, nickel and cobal.

ii. False: Magnetism of electromagnet is temporary.

iii. True

iv. False: Like poles repel each other and unlike poles attract each other.

v. False: The magnetic force is concentrated at the poles of the magnet