Technologies Electricity & Magnetism

Adding a second battery to an electromagnet will _____.

• decrease the resistance in the wire

• decrease the magnetism in the wire

• increase the current flowing through the wire

• increase the amount of current needed to magnetize the wire

Which of the following statements describes an electric generator?

• A magnet is rotated through a coil of wire to produce an electric current.

• Electric potential in a rotating coil of wire creates a permanent magnet.

• An electrical current causes a coil of wire to rotate in a magnetic field

• Forces from a permanent magnet allow a coil of wire to rotate.

Which diagram correctly represents the direction of the magnetic field around a bar magnet?

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NGSS.MS-PS2-3

As the number of turns on an electromagnet is decreased, the pole strength of the electromagnet

• Decreases

• Increases

• Remains the same

Which diagram best illustrates the magnetic field that exists around a current- Carrying wire?

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Two magnets move away from each other. What happens to the magnetic attraction between them as they become further apart?

• It decreases

• it increases

• it becomes zero

• it does not change

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?

• Iron

• wood

• copper

• aluminium

Which of the circuits shown below will make both light bulbs glow?

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Tags

NGSS.MS-ETS1-1

Which of the following statements best compares direct current (DC) and alternating current (AC)?

• AC flows in only one direction, and DC flows in both directions.

• DC flows in only one direction, and AC flows in both directions.

• AC comes directly from a power plant, and DC comes from a magnetic field.

• DC can maintain a constant voltage over time, and AC loses voltage over time.

Which of the following is most likely to require direct current (DC) for proper operation?

• blender

• flashlight

• electric heater

• microwave oven