Magnetism and Its Applications

What is the key principle that allows the pencil to levitate?

• The pencil is made of a special material.

• The pencil is lighter than air.

• The pencil is attached to a string.

• The magnetic poles are aligned to repel each other.

What happens when you try to push two north poles of magnets together?

• They attract each other.

• They repel each other.

• They become neutral.

• They lose their magnetism.

How can you increase the strength of an electromagnet?

• By using a plastic core.

• By adding more loops to the coil.

• By decreasing the electric current.

• By using a longer wire.

What is a common use of electromagnets in junkyards?

• To create light.

• To power vehicles.

• To lift and move heavy metal objects.

• To generate electricity.

What is the main advantage of maglev trains over traditional trains?

• They are cheaper to build.

• They can travel faster without friction.

• They use less electricity.

• They are easier to maintain.