Magnetism

The diagram shows the north pole of a magnet moved into, and out of, a coil of wire.

What describes the poles produced in the coil at X by the movement of the magnet?
1. north pole in: N; north pole out: N
2. north pole in: N; north pole out: S
3. north pole in: S; north pole out: N
4. north pole in: S; north pole out: S
A bar magnet is broken into three parts X, Y and Z.

Which diagram shows the poles in X, Y and Z?
1. A
2. B
3. C
4. D
Zinc and steel scrap are separated using an electromagnet made of copper wire wound around an iron core.

Which of the materials in this process are non-magnetic?
1. copper and steel
2. copper and zinc
3. iron and steel
4. iron and zinc
When a magnet was pushed towards a solenoid, the meter connected to the solenoid showed a deflection to the right.
When the same magnet was pulled away from the solenoid at a faster speed, what was the deflection on the meter?
1. Greater and to the left
2. Greater and to the right
3. The same and to the left
4. The same and to the right
End X of a metal rod attracts the N-pole of a compass needle.

What does this show about the rod?
1. It could be made of copper but is unmagnetised.
2. It could be made of copper with a S-pole at X.
3. It could be made of steel but is unmagnetised.
4. It could be made of steel with N-pole at X.
A bar magnet is placed between two iron bars.

Which diagram correctly shows the poles induced in both iron bars?
1. A
2. B
3. C
4. D
Iron and steel cylinders can both be magnetised by placing them inside a solenoid (coil) connected to a d.c. supply.

Which pair of statements about the magnetic strengths of the iron and steel cylinders is correct?
1. with supply switched on: iron stronger; after supply is switched off: iron stronger
2. with supply switched on: iron stronger; after supply is switched off: steel stronger
3. with supply switched on: steel stronger; after supply is switched off: iron stronger
4. with supply switched on: steel stronger; after supply is switched off: steel stronger
Diagram 1 shows the magnetic field pattern near a bar magnet and an object XY.

Diagram 2 shows the pattern that is obtained when XY is turned around.
What is XY?
1. A copper rod
2. A magnet with the N pole at X
3. A magnet with the N pole at Y
4. A soft-iron rod
The diagram shows a box that has a bar magnet hidden inside it.

Compasses are placed around the outside and their needles point as shown.

Which diagram shows the position of the magnet inside the box?
1. A
2. B
3. C
4. D
The diagram shows a 12 V d.c. power supply, connected across a coil of wires, with a metal core.

The core becomes a strong magnet when the current is switched on.

It remains a magnet after the current is switched off.
Which metal is the core made of?
1. Aluminium
2. Copper
3. Soft iron
4. Steel
An experiment was carried out using four rods made of different materials which were placed, in turn, in a coil of wire.

A large direct current was passed through the coil for a few seconds and was then switched off.

As a result one of the rods was permanetly magnetised by this experiment.
Which one?
1. Glass
2. Iron
3. Plastic
4. Steel
One end, X, of a metal rod attracts the N pole of a compass needle.

This shows the rod could be ...........................
1. made of steel with a N pole at X
2. made of steel but unmagnetised
3. made of copper but magnetised
4. made of copper with a S pole at X
A coil of copper wire wrapped a core could be used as an electromagnet.

Which combination would produce the strongest electromagnet?
1. Number of turns: Few; Core: soft-iron
2. Number of turns: Few; Core: steel
3. Number of turns: Many; Core: copper
4. Number of turns: Many; Core: soft-iron
A scrap metal dealer uses a larger electromagnet.

Which pair of metals will it pick up?
1. Aluminium and brass
2. Copper and iron
3. Brass and copper
4. Iron and steel
Permanent magnet is used in .........................
1. a transformer
2. a electromagnet
3. a relay
4. a plotting compass
A magnet was used to distinguish three metal bars, brass, iron and steel. The following diagram illustrates the number of tacks picked up by each metal bar.

Name the metals.
1. Metal 1: Brass; Metal 2: Iron; Metal 3: Steel
2. Metal 1: Steel; Metal 2: Brass; Metal 3: Iron
3. Metal 1: Steel; Metal 2: Iron; Metal 3: Brass
4. Metal 1: Iron; Metal 2: Steel; Metal 3: Brass
A permanent magnet is placed close to PQ a bar of soft iron.

What are the polarities of ends P and Q?

end P end Q
A N N
B N S
C S N
D S S
1. A
2. B
3. C
4. D
Which question has to be asked to decide if a material is magnetic or non-magnetic?
1. Can it affect the direction of a compass needle?
2. Can it be given an electric charge?
3. Is it a conductor or an insulator?
4. Is it a metal or a non-metal?
Which of the following materials can never be picked up by a magnet?
1. Cobalt
2. Copper
3. Iron
4. Nickel
Which of the following contains one magnetic and one non-magnetic metal?
1. Aluminium, Copper
2. Copper, Lead
3. Iron, Tin
4. Lead, Iron
Which statement describes an example of induced magnetism?
1. A bar magnet attracts a piece of soft iron.
2. A bar magnet loses its magnesium if it is repeatedly dropped.
3. A bar magnet, swinging freely, comes to rest pointing North-South.
4. Two North poles repel each other, but a North pole attracts a South pole.
Which of the following proves that a piece of metal is already a magnet?
1. A magnet is attracted to it.
2. Both ends of a compass needle are attracted to it.
3. Copper wire is attracted to it.
4. One end of a compass needle is repelled by it.
Which one of the following materials is most suitable for the core of an electromagnet?
1. Air
2. Brass
3. Aluminium
4. Iron
Which two materials are most likely to be used for the coil and core of an electromagnet?
1. coil: Copper; core: Iron
2. coil: Copper; core: Steel
3. coil: Iron; core: Iron
4. coil: Iron; core: Steel

	end P	end Q
A	N	N
B	N	S
C	S	N
D	S	S

Magnetism

Multiple Choice Questions