Quiz Magnetism and Electromagnetism

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• 9A
• 9B
• 9C
• 9D

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which statement describes a property of a magnet?

• A It attract to ferrous materials
• B It could have only one pole (North or Souh)
• C It points in a random direction when suspended
• D it repel non-ferrous materials

Diagram 1 shows a small compass needle with its poles marked. It is not near any magnetic materials. Diagram 2 shows a bar magnet with its poles marked. The compass needle is placed at point P.

• to the left
• to the right
• down the page
• up the page

The diagrams show two bar magnets which are attracting each other. Which diagram shows the magnetic field pattern between the poles?

• A
• B
• C
• D

Which diagram shows the pattern and direction of the magnetic field lines around a bar magnet?

• 
• 
• 
• 

• A
• B
• C
• D

A train of steel nails and a train of iron nails hang from a strong magnet.

• A Both trains fall apart.
• B Both trains stay together.
• C Only the train of iron nails falls apart.
• D Only the train of steel nails falls apart.

The circuit shows one method of magnetising a steel bar.

• remove the steel bar from the coil whilst the current is switched on
• replace the d.c. supply with an a.c. supply and gradually reduce the supply voltage to zero
• reverse the polarity of the d.c. supply
• reverse the polarity of the d.c. supply and gradually reduce the supply voltage to zero