Electromagnetic Review

What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 

• The magnet would explode 

• Electric current will flow through the wire

• It would produce a gravitational field

Tags

NGSS.HS-PS2-5

What is one way to increase the current in a wire?

• Decrease the number of coils

• Increase the number of coils

• Move the magnet slower

• Take the wire off of the magnet

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NGSS.HS-PS2-5

If you wrap more coils around an electromagnet, it will become...

• brighter

• stronger

• weaker

• invisible

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NGSS.HS-PS2-5

If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops,

• one-half as much voltage is induced.

• the same voltage is induced.

• twice as much voltage is induced.

• four times as much voltage is induced.

Tags

NGSS.HS-PS2-5

Can you produce current in a wire with a magnet that is sitting still?

• Yes; having a magnet near a wire is enough to excite the electrons

• No; the magnetic field has to be changing to excite the electrons

• No; magnets cannot create electricity

Which pairs of materials could be used to create electromagnetic induction?

• Coiled wire, a magnet

• Coiled wire, a battery

• A magnet, a battery

• None of the above

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs

• Add more light bulbs and/or wire coils

• add more wire coils and/or a switch

• add more wire coils and/or batteries

A __________ is an electrical device that converts AC electricity from one voltage level to another

• transformer

• primary coil

• secondary coil

• center tap

Will a transformer work with direct current (d.c.) or alternating current (a.c.)?

• a.c. only

• d.c. only

• Both a.c. and d.c.

Tags

NGSS.HS-PS2-5

What will happen when these magnets are brought close together?

• They will attract each other.

• They will repel each other.

• Both magnets will turn to the left

• Both magnets will turn to the right

Tags

NGSS.HS-PS3-5