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A magnet that forms when electric current flows through a wire that is wrapped around a piece of metal is called an _________________.
electromagnet
magnetic field
poles
Objects with the same kind of electric charge __________ each other.
repel
attract
electromagnet
A magnet's magnetism is strongest at the __________.
repel
electromagnet
poles
The pushing or pulling force caused by a magnet is called ______________.
magnetism
poles
attract
The area around a magnet where the force of the magnet can act is called the ________________.
electromagnet
magnetic field
repel
True or False: The magnetism of a BAR MAGNET is temporary because it has a switch that turns electric current on and off.
True
False
The only electric charge that can move from object to object is a POSITIVE charge.
False
True
An ELECTROMAGNET can be made stronger by increasing the electric current flowing through the electromagnet's wire.
False
True
In CURRENT electricity, the negative charges have a continuous flow through a material.
False
True
The invisible magnetic field can be observed by sprinkling ____________ around the magnet.
bits of paper
iron fillings
pieces of plastic
A form of energy that involves the flow of electric charges is called ___________.
electricity
an insulator
magnetism
All matter is made up of tiny particles that have electric charges. The tiny particles are called _______.
atoms
circuits
conductors
An object that attracts certain metals is called ________________.
a circuit
a magnet
an insulator
When electric charges build up on the surface of an object, ___________ occurs.
a circuit
static electricity
current electricity
A material that allows electricity to flow through it easily is called ________.
an insulator
a conductor
a circuit
How have electromagnets helped people solve real life problems? (Tell at least two ways in two complete sentences)
Electromagnets are used in fire alarms, toasters, microwaves, doorbells, TV's, computers, trains, and MRI machines.
