Magnetism and electromagnetism

Which of the following defines magnetism?

• Magnetism is a contact force.

• Magnetism is a force created by magnets.

• Magnetism is an invisible force that attracts electrically charged particles.

• Magnetism is energy created by magnets.

Which of the following principles explains how an electric motor works?

• Magnetic force

• Magnetism

• Electrolysis

• Electromagnetism

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Which two forces are required to operate with generators and electric motors?

• Electric and magnetic

• Electric and thermal

• Magnetic and Radiant

• Magnetic and thermal

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The magnetic field in electromagnets is produced due to

• The conductor material
• Magnets
• Electric current
• All of the above

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The magnetic field , when electric current is passed through a straight metallic conductor is in the shape of

• Overlapping circles
• Single circle
• Concentric ovals
• Concentric circles

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We can increase the magnetic field of an electromagnet by

• Decreasing the magnitude electric current
• Increasing the magnitude electric current
• Decreasing the length of the conductor
• Increasing the length of the conductor

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The strongest parts of the magnet are ...

• fronts

• backs

• poles

• middle

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The area around a magnet is called the .....

• attraction zone

• work area

• magnetic field

• hot zone

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The closer the charges, the ___________ the force between them

• closer
• further
• stronger
• weaker

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The picture is an example of an:

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

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