PHYSICS LEVEL 10 UNIT 15 PG

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?

• A

• B

• C

• D

Which statement about magnetism is correct?

• An unmagnetised iron bar becomes magnetised when it is placed near a magnet.

• An unmagnetised steel bar can be magnetised by passing a current through it.

• The direction of magnetic field lines is from an S-pole to an N-pole.

• The N-poles of two magnets attract each other.

In which pair are both materials magnetic?

• aluminium and copper

• copper and iron

• iron and steel

• steel and aluminium

Which diagram shows the poles of the magnets?

• 
• 
• 
• 

Which metal and which power supply are used to make a permanent magnet?

• iron, 6 V a.c.

• iron, 6 V d.c.

• steel, 6 V a.c.

• steel, 6 V d.c.

Which group contains only non-ferrous metals?

• aluminium, brass, iron

• brass, copper, lead

• copper, iron, steel

• copper, lead, steel

An electromagnet with a soft-iron core is connected to a battery and an open switch. The soft-iron

core is just above some small soft-iron nails.
What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened?

• nails jump up, nails fall down

• nails jump up, nails stay up

• nails stay down, nails jump up

• nails stay down, nails stay down

A student investigates the force on a bar magnet placed near a current-carrying coil. She carries out three different experiments.
Which row shows what happens in the other two experiments?

• Experiment 2: magnet attracted,
  Experiment 3: magnet attracted

• Experiment 2: magnet repelled,
  Experiment 3: magnet attracted

• Experiment 2: magnet attracted,
  Experiment 3: magnet repelled

• Experiment 2: magnet repelled,
  Experiment 3: magnet repelled

Which magnetic poles are induced at the ends J and K of the iron rods?

• J: N
  K: N

• J: N
  K: S

• J: S
  K: N

• J: S
  K: S

Which diagram shows the magnetic poles induced in the nails?

• A

• B

• C

• D