Magnetic Effect of Electric Current Quiz

What happens to the compass when there is current flowing through the copper rod?

• The compass needle deflects.

• The compass needle remains stationary.

• The compass needle spins rapidly.

• The compass needle points south.

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What does Figure 12-2 demonstrate about the magnetic field produced by the current in a wire?

• The magnetic field shows up as concentric circles of iron filings around the wire.

• The magnetic field is a straight line parallel to the wire.

• The magnetic field is a series of random lines crossing each other.

• The magnetic field is a spiral pattern along the length of the wire.

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According to the first right-hand rule, what is the direction of the magnetic field produced by this current-carrying wire?

• counterclockwise

• clockwise

• up

• down

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What is a solenoid and what does it produce?

• A solenoid is a coil made with multiple loops that produces a stronger magnetic field.

• A solenoid is a type of battery that stores electrical energy.

• A solenoid is a device that converts sound into electrical signals.

• A solenoid is a type of resistor used to control current flow.

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Which component could you use to change current to find out is it affects the strength of a magnetic field?

• potentiometer

• solenoid

• switch

• 3 AA batteries

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What factors impact the strength of the magnetic field of the solenoid?

• Number of turns in the coil

• Current flowing through the solenoid

• Material of the core

• All of the above

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What is an electromagnet?

• An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

• An electromagnet is a permanent magnet that does not require electricity.

• An electromagnet is a device that uses magnetic fields to generate electricity.

• An electromagnet is a type of magnet that is made from natural materials.

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What happens to the magnetic field of an electromagnet when the current is turned off?

• The magnetic field disappears when the current is turned off.

• The magnetic field strengthens when the current is turned off.

• The magnetic field remains the same when the current is turned off.

• The magnetic field reverses direction when the current is turned off.

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According to the second right-hand rule, if you curl your fingers around the loops in the direction of the conventional current, where will your thumb point?

• Your thumb will point toward the north pole of the electromagnet.

• Your thumb will point toward the south pole of the electromagnet.

• Your thumb will point in the direction of the electric field.

• Your thumb will point in the direction of the magnetic field lines.

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What happens when you change the direction of the current?

• The current stops flowing

• The direction of the magnetic field reverses

• The voltage increases

• The resistance decreases

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