ET unit 11 -- magnetic fields

What does a field diagram show?

• the shape of a landscape

• the force of gravity

• magnetic field lines

• the time it takes for magnetic force to travel over a distance

A student drew magnetic field lines incorrectly. What is wrong in the drawing?

• the field lines are crossed in some places

• the lines are pointing into the south pole

• the poles are in the wrong place

• the drawing shows 2 poles

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Why does a compass point North?

• The Earth's magnetic field is stronger in the North.

• A compass needle is magnetized to be attracted to the north pole

• Earth's north geographic pole is a south magnetic pole

• A compass does not follow the "opposites attract" rule

What happens to the magnetic domains in ferromagnetic material when an external magnet is brought close to it?

• The magnetic field gains strength from the domains

• The domains in the iron repel each other

• Some domains grow and others shrink

• All the domains in the iron become larger

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What happens to Earth's magnetic field approximately every million years?

• It intensifies

• It weakens

• it moves several degrees

• It reverses

Which direction would the arrow point if you drew the vector for the magnetic field line at point 3 in the diagram?

• upwards

• toward the magnet

• away from the magnet

• downwards

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Which direction would the arrow point if you drew the vector for the magnetic field line at point 4 in the diagram?

• upwards

• downwards

• to the left

• to the right

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Electric, magnetic, and gravitational fields are examples of ---

• ferromagnetic forces

• kinetic forces

• non contact forces

• domain forces

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Where is the magnetic field strongest?

• point A

• point B and C

• point D

• point C

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In a ferromagnetic material, what happens to domains repelled by an external magnet?

• reverse poles

• become more organized

• increase in size

• lose atoms and shrink