Electromagnetic Forces

The attractive force between two magnets increases. Which statement explains why this would happen?

• The like poles of the magnets are pointed at each other and move farther apart.

• The like poles of the magnets are pointed at each other and move closer together.

• The unlike poles of the magnets are pointed at each other and move farther apart.

• The unlike poles of the magnets are pointed at each other and move closer together.

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Which of these determines whether or not a material is magnetic?

• the density of the material

• the weight of the material on Earth

• the alignment of atoms in the material

• the number of elements that make up the material

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Which of these is the best definition of electromagnetism?

• the use of electrical energy to produce magnets

• the use of magnets to generate electric current

• the interaction of electricity and magnetism

• the appearance in nature of objects that have both electric and magnetic fields

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Which statement describes how electromagnetism is used in an electric generator?

• Moving a magnet in a coil of wire produces visible light.

• Magnets convert electric energy into mechanical energy.

• Magnets detect the presence of electric currents in nature.

• Moving a magnet in a coil of wire generates an electric current.

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Which pair of particles will attract each other?

• proton and electron

• electron and electron

• proton and neutron

• electron and neutron

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Which pair of particles will repel each other?

• proton and electron

• electron and electron

• proton and neutron

• electron and neutron

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This image shows neutral objects becoming charged. What happens to the sweater?

• It loses electrons to become positive.

• It gains electrons to become negative.

• It loses protons to become negative.

• It gains protons to become positive.

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This image shows neutral objects becoming charged. What happens to the balloons?

• They lose electrons to become positive.

• They gain electrons to become negative.

• They lose protons to become negative.

• They gain protons to become positive.

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Which type of particle is transferred when the balloon rubs on the sweater?

• protons

• neutrons

• electrons

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Two factors effecting the magnitude of the force of gravity between 2 objects are...

• Mass and Distance 
• Mass and Matter
• Distance and Weight 
• Weight and Mass

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