Electricity and Magnetism Test Review

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have opposite charges

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

Surrounding each magnetic is an invisible force field called

• Gravity

• A magnetic field

• An electric field

• The Force

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NGSS.MS-PS2-5

In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

• The more coils an electromagntic has, the stronger the magnetic field

• The more coils an electromagntic has, the weaker the magnetic field

• The larger the metal object, the stronger the magnetic field is

• There is no relationship between number of coils and the strength of a magnetic field

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NGSS.MS-PS2-3

To decrease the strength of a magnetic field around an electromagnet, we must

• increase the number of coils

• increase the size of the iron core

• decrease the size of the iron core

• decrease the number of coils

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What is the cause of electricity? (Think of John Travoltage!)

• Magnetism

• Gravity

• Moving electrons

• Lightning

The tool that used magnetic forces to show  which direction is north is _______.

• Pole
• Compass
• Attract
• Repel

A __________ is a particle with negative charge.

• Neutron
• Electron
• Proton

A negative charge and a positive charge will ________.

• Attract
• Repel

Tags

NGSS.MS-PS2-3

A positive charge and a positive charge will _______.

• Attract 
• Repel

Tags

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