7.2 Electricity & Magnetism

Which pole of the electromagnet is attracted to the north pole of the permanent magnet?

• South Pole

• North Pole

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Match the following:

• north or south end of a magnetic where the field is strongest

• Magnetic Pole

• when something can exert magnetic forces

• Permanent Magnet

• an object that is impacted by magnets but is not a magnet

• Magnetic Materials

• an object that is magnetic

• Magnetic

• an object that stays magnetic

• Magnet

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How could you investigate the strength of an electromagnet?

• See how many plastic beads it can hold

• See how many steel paper clips it can hold

• See how many copper nails it can hold

• See how many brass tacks it can hold

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How can the strength of an electromagnet be increased?

• by rubbing it with a stronger magnet
• by increasing the coils of wire around the iron
• by increasing the length of the wire from the battery
• by loosening the coil of wire around the iron

A single wire carrying electric current that is wrapped into a cylinder-shaped coil is called a ____________.

• current

• solenoid

• permanent magnet

• battery

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Electric current passing though a wire produces ________.

• 1. a magnetic field around the wire

• a permanent magnet

• geographic poles

• a compass

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• Which of the following best describes an electromagnet?

• permanent magnet

• insensitive to electric currents

• unchanging magnetic properties

• temporary magnet

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What effect does increasing the current in the wire have on an electromagnet?

• It decreases the strength of the magnetic field.

• It increases the strength of the magnetic field.

• It has no effect on the electromagnet.

• It causes it to become a permanent magnet.

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Which of the following changes electrical energy into mechanical energy?

• generator

• electric motor

• transformer

• superconductor

• In order for the electromagnetic coil in the motor to keep turning, the current must ________.

• continue in one direction

• periodically increase in strength

• change direction

• be through an ammeter

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