Magnet Quiz

What is a permanent magnet?

• The permanent magnet has its own magnetic field.
• A permanent magnet doesnt have its own magnetic field.
• A permanent magnet never repels.

What is an induced magnet?

• An induced magnet can produce its own magnetism.
• An induced magnet has aligned spins.
• An induced magnet becomes a magnet when it is placed in the magnetic field of a permanent magnet.
• The induced magnet is an electoric thingy.

How can you find if both magnets are permanent?

• If there is no repulsion between the 2 magnets.
• If there is repulsion between the 2 magnets.
• If it attracts to each other.
• By picking up magnetic materials such as iron nails.

What are the three magnetic materials?

• Nickel, Einsteinium and pottasium
• Iron, magnesium and aluminium
• Tungsten, cobalt and nickel
• Iron, cobalt and nickel

Name AN advantage of an electromagnet....

• They generate an electromagentic field which may disrupt other electronic devices.
• They require a lot of electricity to heat up so that it works.
• It can be switch on and off.
• The electromagnet is cool.

What is true about solenoids?

• Solenoids are permanent magnets.
• The field around a solenoid has the shape as a bar magnet.
• the part inside the coils is the weakest

What can happen if you place a compass near a strong magnet?

• It will point at north forever.
• The compass will stay normal as usual.
• The compass will point at a wrong direction.

What is the function of a relay switch?

• The relay switch can switch on and off.
• The relay switch controls a high current circuit
• The relay switch controls the electric bell.

What is the function of the striker in the electric bell?

• It controls the whole circuit.
• It strikes the electric magnet to work.
• it strikes the bell to make a sound