Chapter 10 - Magnetic Fields

An object that is magnetic has ____ .

• only a south-seeking pole

• only a south-seeking pole

• an east-seeking pole and a west-seeking pole

• a north-seeking pole and a south-seeking pole

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The magnitude of the current in a wire is ____ to the magnetic field around the wire.

• proportional

• inversely proportional

• equal

• parallel

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Increasing the number of loops in an electromagnet causes the strength of the magnetic field to ____.

• increase

• decrease

• remain the same

• remain the same

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The magnetic force on a current-carrying wire in a magnetic field is ____ the direction of

the current.

• opposite

• parallel to

• perpendicular to

• the same as

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What happens if you cut a magnet in half?

• it becomes demagnetized

• you get a separate south pole and a separate north pole

• you get monopoles

• you get two magnets

Magnetic domains are __________ in a magnet.

• scattered

• aligned

• misaligned

• random

How can you make a magnet out of a long strand of wire and an iron bar?

• Send a current through the bar.

• Spin the bar over the wire as a current runs through it.

• Wrap the wire around the bar, and send a current through it.

• Attach the wire to either end of the bar, and send a current through it. Attach the wire to either end of the bar, and send a current through it.

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If current is reduced in an electromagnet, what happens to the magnetic field strength?

• it cancels out the magnetic field

• it remains the same

• it is reduced

• it increases it increases

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A nail that touches a magnet will __________.

• melt

• generate an electric current

• demagnetize the magnet

• become polarized become polarized

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In the figure below, if the magnetic poles were reversed, what would the direction of the magnetic force be?

• right

• down

• up

• left

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