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Solved problems for the chapter:

Magnetic Properties of Soft Iron and Steel

View the theory »

Magnetic Induction

1. Magnetic flux

2. Faraday's law of induction

3. Self induction

4. Direction of induced voltage

5. Forum

↓ Show theory [1] ↓

Detailed solution steps are available at:

https://en.openprof.com/wb/chapter:magnetic_properties_of_soft_iron_and_steel/3627/

Example 1.

In which pair are both metals ferrous?

aluminium and copper
iron and steel
aluminium and steel
copper and iron

Example 2.

Which row shows whether iron and steel are ferrous or non-ferrous?

	iron	steel
A	ferrous	ferrous
B	ferrous	non-ferrous
C	non-ferrous	ferrous
D	non-ferrous	non-ferrous

A piece of iron and a piece of steel are picked up by an electromagnet as shown.

The current to the electromagnet is switched off. What happens?

Both the iron and the steel remain magnetised.
Neither the iron nor the steel remains magnetised.
Only the iron remains magnetised.
Only the steel remains magnetised.

In a child’s toy, metal fish are lifted out of a toy pond using a metal rod. The fish are magnetically attracted to the end of the rod. There is no magnetic force between the fish themselves.

What are possible materials from which the fish and the rod are made?

	fish	rod
A	aluminium	soft iron
B	aluminium	steel
C	soft iron	soft iron
D	soft iron	steel

Which statement describes a property of a magnet?

It attracts ferrous materials.
It could have only one pole (north or south).
It points in a random direction when suspended.
It repels non-ferrous materials.

In which pair are both materials magnetic?

aluminium and copper
copper and iron
iron and steel
steel and aluminium

A student wishes to make a permanent magnet. She has an iron rod and a steel rod. Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

	rod	type of magnetic material
A	iron	hard
B	iron	soft
C	steel	hard
D	steel	soft

A hard magnetic material can be used to make a permanent magnet. A soft magnetic material can be used to make a temporary magnet. Which row shows whether iron and steel are hard or soft magnetic materials?

	iron	steel
A	hard	hard
B	hard	soft
C	soft	hard
D	soft	soft

An electromagnet is used to separate magnetic metals from non-magnetic metals. Why is steel not suitable as the core of the electromagnet?

It forms a permanent magnet.
It has a high density.
It has a high thermal capacity.
It is a good conductor of electricity.

10.

Which row correctly shows whether copper and steel are ferrous or non-ferrous?

	copper	steel
A	ferrous	ferrous
B	ferrous	non-ferrous
C	non-ferrous	ferrous
D	non-ferrous	non-ferrous

11.

A permanent magnet is made from metal and an electromagnet uses a metal core. Which metal is suitable for each of these purposes?

	permanent magnet	core of electromagnet
A	iron	iron
B	iron	steel
C	steel	iron
D	steel	steel

12.

The diagram shows two bar magnets, stored with metal keepers across the ends. The keepers help to keep the magnets magnetised.

The material used for the keepers becomes strongly magnetised when placed in contact with the magnets, but does not remain magnetised when taken away from the magnets. What is a suitable metal to use for the magnets and what is a suitable metal to use for the keepers?

	metal for magnets	metal for keepers
A	iron	iron
B	iron	steel
C	steel	iron
D	steel	steel

13.

Which group contains only non-ferrous metals?

aluminium, brass, iron
brass, copper, lead
copper, iron, steel
copper, lead, steel

14.

Which row states whether each metal is ferrous or non-ferrous?

	ferrous	non-ferrous
A	aluminium	copper
B	copper	iron
C	iron	steel
D	steel	aluminium

15.

Which metal could be used for a permanent magnet and which metal could be used for the core of an electromagnet?

	permanent margnet	core of electromagnet
A	iron	copper
B	iron	steel
C	steel	copper
D	steel	iron

16.

A permanent magnet is brought near to a piece of copper. The copper is not attracted by the magnet. Why is there no attraction?

Copper is ferrous but is only attracted by an electromagnet.
Copper is ferrous but is not attracted by any type of magnet.
Copper is not ferrous and is only attracted by an electromagnet.
Copper is not ferrous and is not attracted by any type of magnet.

17.

Small particles of metal are scattered near a bar magnet to show the pattern of the magnetic field. Which metal is suitable?

aluminium
brass
copper
iron

18.

From which materials are the coil and the core of an electromagnet made?

	coil	core
A	copper	copper
B	copper	iron
C	iron	copper
D	iron	iron

19.

A student wishes to use a magnetising coil to make a permanent magnet from a piece of metal.

Which metal should she use?

aluminium
copper
iron
steel