Understanding Magnets and Magnetic Fields

What happens when you cut a magnet in half?

• The magnet loses its magnetic properties.

• The magnet becomes stronger.

• You get two magnets, each with a north and south pole.

• You get two monopole magnets.

How can an iron nail be magnetized?

• By placing it in water.

• By coating it with a magnetic material.

• By aligning its magnetic domains using a strong magnetic field.

• By heating it to a high temperature.

In which direction do magnetic field lines point around a bar magnet?

• They do not have a specific direction.

• In a circular pattern around the magnet.

• From north to south.

• From south to north.

What is the unit of magnetic field strength?

• Watt

• Tesla

• Joule

• Newton

Why does a compass point towards the magnetic north?

• Because the Earth's magnetic north is a magnetic south pole.

• Because the compass needle is repelled by the Earth's core.

• Because the Earth's magnetic field is weak.

• Because the compass needle is attracted to the sun.

What is the right hand rule used for?

• To calculate the speed of light.

• To measure the strength of a magnetic field.

• To determine the direction of electric current.

• To find the direction of magnetic fields around a current-carrying wire.

How is a magnetic field represented around a current-carrying wire?

• As a single line through the wire.

• As random dots around the wire.

• As concentric circles around the wire.

• As straight lines parallel to the wire.

What is an electromagnet?

• A permanent magnet that cannot be turned off.

• A magnet created by wrapping a wire into a coil and passing current through it.

• A magnet that loses its magnetism over time.

• A magnet that is naturally occurring.

What happens to the magnetic field inside a looped wire?

• It remains the same.

• It disappears.

• It becomes weaker.

• It becomes concentrated and stronger.

Which of the following is a practical application of electromagnets?

• Solar panels

• Hydroelectric dams

• Wind turbines

• Maglev trains