Magnets Review

What happens when two north poles of a magnet are placed together?

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

The force of magnetism is stronger when magnets are ________________

• cold
• round
• closer together
• farther apart

What do the lines around this magnet represent?

• North Pole
• South Pole
• Magnetic Declination
• Magnetic Field

Magnetism is generated by moving

• protons.
• electrons.
• neutrons.
• elements.

In a magnetized material, most of the domains are arranged in the same direction. In a material that is not magnetized, the domains point in _________ directions.

• same

• random

The strength of an electromagnet can be affected by

• changing the current in the wire

• changing the number of loops in the solenoid

• changing the size of the iron core

• all of the above

Electric motors are devices that convert _____ energy into  _____ energy.

• electrical; mechanical
• mechanical; electrical
• chemical; potential
• mechanical; kinetic

How does a generator work?

• changing chemical energy into mechanical energy

• by changing nuclear energy into mechanical energy

• by making energy go through foil and putting that through a magnetic wire making electricity

• the magnetic field exerts a force on the moving electron that pushes them along the wire creating an electric current