Electromagnetism

Which statement is true?

• As the electric current through a wire increases, the magnetic field around the wire becomes stronger.

• As the electric current through a wire increases, the magnetic field around the wire becomes weaker.

• As the electric current through a wire increases, the magnetic field around the wire is unaffected.

• As the electric current through a wire decreases, the magnetic field around the wire becomes stronger.

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which of the following conditions is necessary for a magnet inside a wire loop to produce an electric current?

• The magnet must be stationary.

• The wire loop must be part of an open circuit.

• The wire loop must already have a current running through it.

• The magnet must be in motion.

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NGSS.HS-PS2-5

Which statement is false?

• ) The direction a magnet moves through a coil of wire determines the direction of the electric current.

• The direction a coil of wire moves through a magnetic field determines the direction of the electric current.

• Current will flow through a wire as long as the magnetic field around the coil is changing.

• Current will not flow though a wire if the magnet is outside the coil.

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

By changing the current in the wire, you can change the ____ of an electromagnet.

• strength and charge

• direction and coils

• charge and strength

• strength and direction

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NGSS.HS-PS2-5

Changing the _________ of the current in a wire coils reverses an electromagnet’s north and south poles.

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which is the best prediction for what will happen to the reading on the meter when the magnet stops and then is moved down through the loop of wire?

• The reading will not change.

• The reading will drop to zero and then return to the same reading.

• The reading will drop to zero and then move in the negative direction.

• The reading will drop to zero and remain there.

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NGSS.HS-PS2-5

In the figure shown, what happens when the amount of current flowing in the wire coil is increased?

• The magnetic field becomes stronger.

• The magnetic field disappears.

• The position of the north and south poles is reversed.

• The strength of the magnetic field decreases.

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NGSS.HS-PS2-5

In the figure shown, what would happen if the direction of the current in the wire coil were reversed?

• The electromagnet would no longer work.

• The north and south poles would switch places.

• The strength of the magnetic field would increase.

• The strength of the magnetic field would decrease.

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NGSS.HS-PS2-5

An electromagnet is a current-carrying wire wrapped around a copper core

• True

• False

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