Electric and Magnetic Forces

Front

What is static electricity?

Back

Static electricity is the buildup of electric charges on the surface of objects.

Front

Why is a balloon attracted to hair after being rubbed together?

Back

The balloon and the hair have opposite charges.

Front

What happens to the strength of a magnetic field when the number of coils in an electromagnet increases?

Back

The strength of the magnetic field increases.

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

Front

How can you decrease the strength of a magnetic field around an electromagnet?

Back

By decreasing the number of coils.

Front

What are the two types of electric charges?

Back

Positive and negative charges.

Front

What happens when two like charges are brought close together?

Back

They repel each other.

Front

What happens when two opposite charges are brought close together?

Back

They attract each other.

Front

What is the role of an iron core in an electromagnet?

Back

The iron core enhances the magnetic field produced by the coils of wire.

Front

What is the relationship between the size of the iron core and the strength of the magnetic field?

Back

A larger iron core can increase the strength of the magnetic field.