Magnetism

What do the lines around this magnet represent?

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

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole
• Both halves get only a North Pole
• Both halves get only a South Pole
• Both halves get a North pole and a South Pole

The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.

What causes magnetism?

• the sun

• moving neutrons

• moving charges

• friction

If you place the North pole of a magnet next to the South pole of another magnet, they will:

• Attract
• Repel
• Do nothing
• Shatter

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

A simple electromagnet can be made with which of the following?

• an electric current
• a turbine and nail
• a nail, a wire, and a battery
• a compass and a battery

What happens if you cut a bar magnet in half?

• You get two North pole magnets
• You get two South pole magnets
• You get a North pole magnet and a South pole magnet
• You get two smaller magnets, each with a North and South pole

Two ways to increase the magnetic force of an electro-magnet

• Increase the current flow, reduce the number of coils
• Increase the voltage, decrease the number of coils
• Increase the number of coils and the current flow
• Spread out the coils, replace iron core with rubber.

Electric current passing through a wire produces a ________.

• permanent magnet
• magnetic field around wire
• compass
• geographic poles