Magnetic Forces and Fields Study Guide

What causes Earth's magnetic field?

• Molten iron and nickel in the Earth's outer core

• Radioactive elements inside the Earth

• Rocks in the Earth's crust

• The Sun

What can you tell from the interacting magnetic poles in the picture above?

• The poles are alike so they are repelling.

• The poles are opposite so they are repelling.

• The poles are opposite so they are attracting.

• The poles are alike so they are attracting.

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Looking at the picture from left to right, what would the order of the poles be?

• From L - North, South and North, South

• From L - North, South and South, North

• From L - South, North and South, North

• From L - South, North and North, South

What can you tell about the poles in the picture above?

• The poles are alike so they are repelling

• From left to right, the poles are south pole to north pole

• From left to right, the poles are north pole to south pole

• The poles are alike so they are attracting

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What maps out the invisible magnetic field around a magnet?

• magnetic bracelets

• electric field lines

• MRI's

• magnetic field lines

If you break a magnet into two pieces, what happens to its magnetic poles?

• There is no effect.

• Each magnet will have two south poles.

• Each magnet will have two north poles.

• Each magnet will have a north and south pole

Magnetic field lines are used to map out the _______ around a magnet.

• electric field

• gravitational field

• magnetic field

• thermal field

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Which of the following is true about magnetic field lines?

• They start from the south pole and end at the north pole.

• They start from the north pole and end at the south pole.

• They are circular and have no start or end.

• They are straight lines.

Which of the following materials can be magnetized?

• Wood

• Plastic

• Iron

• Glass

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Magnetic field lines are _______ when they are closer together.

• weaker

• stronger

• unchanged

• invisible

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