Magnetism

Front

What are magnetic field lines?

Back

Magnetic field lines are imaginary lines that represent the direction and strength of a magnetic field. They emerge from the north pole of a magnet and enter the south pole.

Front

How long does a paperclip stay magnetized after touching a magnet?

Back

A paperclip stays magnetized for a short time after touching a magnet.

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet that becomes magnetized when electric current flows through it.

Front

What are the two poles of a magnet called?

Back

The two poles of a magnet are called the north pole and the south pole.

Front

What makes an electromagnet stronger?

Back

An electromagnet becomes stronger with a greater number of loops of wire around its core.

Front

What is the effect of increasing electric current on an electromagnet?

Back

Increasing the electric current flowing through an electromagnet increases its strength.

Front

What happens to a magnet's strength when it is heated?

Back

Heating a magnet can decrease its strength, potentially demagnetizing it.

Front

What is the difference between a permanent magnet and a temporary magnet?

Back

A permanent magnet retains its magnetic properties over time, while a temporary magnet only exhibits magnetism when in the presence of a magnetic field.

Front

What is magnetic induction?

Back

Magnetic induction is the process by which a material becomes magnetized when exposed to a magnetic field.

Front

What materials are commonly used to make permanent magnets?

Back

Common materials for permanent magnets include iron, nickel, cobalt, and certain alloys.