Electric Charges and Forces
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Questions and Answers

A repelling force occurs between two charged objects when the charges are of ____.

  • unequal magnitude
  • equal magnitude
  • unlike signs
  • like signs (correct)

    • When Bethany walks across a carpet, her socks pick up many electric charges. What most likely happened to the charges?

  • The charges broke apart into smaller particles.
  • The charges disappeared.
  • The charges switched signs.
  • The charges transferred to another object. (correct)

    • During a lightning storm, the bottom of a cloud gains a strong negative electric charge. Which of these describes the charge at the top of a tall metal pole directly under the cloud?

  • The top of the pole would have a positive charge. (correct)
  • The top of the pole would have no charge.
  • The charge of the pole would not be affected by the charge of the cloud.
  • The top of the pole would have a negative charge.

    • Which statement describes the force that is exerted on two circular objects with electric charge?

    <p>There is a force pushing the objects away from each other.</p> Signup and view all the answers

    Based on the diagrams, which statement is true about the electric forces between the charged objects?

    <p>The electric force between A and B is identical in magnitude to the electric force between C and D.</p> Signup and view all the answers

    What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge?

    <p>Negative charges are moved from the fur to the rod.</p> Signup and view all the answers

    The distance between a positively charged object and a negatively charged object increases. If everything else remains constant, what happens to the electric force between the objects?

    <p>The electric force decreases.</p> Signup and view all the answers

    Define electric charge and describe what happens to the charge that causes the balloon to attract the hair.

    <p>Electric charge is a property of matter that causes it to experience a force when placed in an electric field. When the balloon is rubbed on carpeting, it gains negative charges, which then causes it to attract neutral hair, inducing a slight positive charge on the hair.</p> Signup and view all the answers

    Describe how a neutral material becomes attracted to a negatively charged object brought near it.

    <p>A neutral material can become attracted to a negatively charged object because the negative charges in the neutral material are repelled, creating a positive charge on the side closest to the negative object.</p> Signup and view all the answers

    What happens if a glass rod is rubbed briefly with silk and becomes able to attract small pieces of paper? What will happen if the rod is rubbed with silk for a longer period of time?

    <p>If the glass rod is rubbed briefly, it will attract a few pieces of paper. Rubbing it for a longer period adds more charge to the rod, allowing it to attract more objects with a stronger force.</p> Signup and view all the answers

    Study Notes

    Electric Charges and Forces

    • Opposite Charges Attract: Like charges repel each other, while opposite charges attract. This is a fundamental principle of electrostatics.
    • Charge Transfer: Objects can gain or lose electric charges through various processes such as rubbing, contact, or induction. When an object gains a charge, it means that it has either gained or lost electrons.
    • Electric Force: The force between charged objects is called the electric force. The strength of this force depends on the magnitude of the charges and the distance between them. Increase in distance causes a decrease in the force.
    • Material Polarization: Neutral objects can become attracted to charged objects due to a process called polarization. This occurs when the charges within the neutral object rearrange in response to the presence of the nearby charged object.
    • Charge Accumulation and Attraction: Objects can become charged through friction, like rubbing a balloon on carpet. This transfer of electrons can cause the balloon to become attracted to objects with an opposite charge, such as hair.
    • Impact of Increased Rubbing: If a glass rod is rubbed with silk for a longer time, the rod will accumulate more electric charge. This will result in a stronger attraction to small pieces of paper.
    • Neutralization: Charges can also be transferred to other objects, causing them to become charged. This is why objects that have been charged through friction may lose their charge over time.

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    Electric Forces Quiz PDF

    Description

    Explore the fundamental principles of electric charges and forces in this quiz. Learn about attraction and repulsion of charges, charge transfer processes, and the electric force between objects. Test your understanding of material polarization and how neutral objects can become charged.

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