Electrostatic Forces in Materials
Physics ⇒ Electricity and Magnetism
Electrostatic Forces in Materials starts at 10 and continues till grade 12.
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A dielectric is inserted between the plates of a charged parallel plate capacitor. What happens to the electrostatic force between the plates?
A plastic rod is rubbed with wool and becomes negatively charged. What happens to the electrons in this process?
Describe what happens to the charges in a conductor when it is placed in an external electric field.
Describe what happens to the electrostatic force between two charges if the medium between them changes from air (εr ≈ 1) to glass (εr ≈ 5).
Explain the difference between conductors and insulators in terms of electron movement.
Explain why metals are good conductors of electricity.
A student rubs a balloon on their hair and the balloon sticks to a wall. Which force is responsible for this phenomenon?
A charged sphere is suspended by an insulating thread and brought near a neutral metal sphere resting on an insulating stand. Describe and explain the sequence of charge movement and the final charge distribution if the metal sphere is briefly grounded while the charged sphere is nearby.
A parallel plate capacitor with air as the dielectric is connected to a battery and fully charged. The battery is then disconnected, and a dielectric slab is inserted between the plates. What happens to the voltage across the plates and the stored energy? Explain your answer.
Which of the following best describes a dielectric material? (1) A material that conducts electricity (2) A material that does not allow electric field lines to pass through (3) A material that can be polarized by an electric field (4) A material with free electrons
Which of the following best explains why a charged comb can attract small pieces of paper? (1) The comb induces a charge on the paper (2) The comb heats the air (3) The comb creates a magnetic field (4) The comb emits light
Which of the following is a correct statement about the behavior of charges in an insulator? (1) Charges move freely (2) Charges are fixed in place (3) Charges are only on the surface (4) Charges are always positive
Which of the following is NOT a dielectric material? (1) Air (2) Water (3) Copper (4) Paper
A charged object is brought near a neutral conductor. The side of the conductor closer to the charged object becomes oppositely charged. This phenomenon is called _______.
If the distance between two point charges is doubled, the electrostatic force between them becomes _______ times its original value.
The ability of a material to resist the flow of electric charge is called _______.
The force between two charges in a material is _______ (greater/less) than the force between the same charges in a vacuum.
State whether the following statement is true or false: "Electrostatic forces can act through a vacuum."
The relative permittivity (dielectric constant) of a material is always greater than or equal to 1. True or False?
True or False: The polarization of a dielectric in an electric field always results in a net charge on the dielectric.
