Electromagnetic Force

The picture is an example of an:

• Electric circuit
• Electromagnet
• Electric nail
• Electric power cell

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A proton (positive charge) and electron (negative charge) are attracted to one another. This is due to...

• Gravitational fields

• Electrical fields

• Magnetic fields

• Track and field

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The electrical wires in many homes are made of copper and covered with plastic. Why are copper and plastic good choices for electrical wires?

• Copper is a conductor of electricity, and plastic is an insulator of electricity.

• Copper is an insulator of electricity, and plastic is a conductor of electricity.

• Copper is a conductor of electricity, and plastic is an insulator of heat.

• Copper is an insulator of electricity, and plastic is a conductor of heat.

The greater the distance between magnets, the _________ the force between them.

• greater

• weaker

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The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

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Why did the compass needle change position when the circuit was closed?

• Electricity also runs through the compass.

• A magnetic field surrounds a current-carrying wire

• The compass-needle change indicates the potential energy

• The magnetic poles of the D-cell reversed

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A circuit is....

• a pathway for the flow of magnetism

• a pathway for the flow of electricity

An electromagnet is...

• Metal that becomes a permanent magnet with electricity

• Metal that becomes a temporary magnet with electricity

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Which component becomes a temporary magnet?

• A - switch

• E - core

• C - wire

• F - battery

Which component controls the flow of electricity by opening and closing the circuit?

• A - switch

• E - core

• C - wire

• F- battery