Electrostatic Forces in Materials
Physics ⇒ Electricity and Magnetism
Electrostatic Forces in Materials starts at 10 and continues till grade 12.
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See sample questions for grade 12
A charged rod attracts small pieces of paper even though the paper is neutral. Explain why this happens.
A dielectric material is placed between the plates of a capacitor connected to a battery. What happens to the charge stored on the plates?
A parallel plate capacitor is filled with a dielectric material of dielectric constant 4. If the original capacitance was C, what is the new capacitance?
A plastic rod is rubbed with wool and becomes negatively charged. What happens to the electrons in this process?
Describe the difference between a conductor and an insulator in terms of electron mobility.
Describe the effect of introducing a dielectric slab between the plates of a capacitor on the energy stored in the capacitor if the capacitor is isolated (not connected to a battery).
Explain why electrostatic shielding is effective in a hollow conductor.
Explain why metals are good conductors of electricity in terms of their atomic structure.
Explain why the electrostatic force is weaker in water than in air.
If the force between two charges in vacuum is F, what will be the force between them if a dielectric of relative permittivity εr is introduced between them?
A glass rod is rubbed with silk and becomes positively charged. Which of the following best explains this? (1) Electrons are transferred from the glass rod to the silk (2) Protons are transferred from the silk to the glass rod (3) Electrons are transferred from the silk to the glass rod (4) Protons are transferred from the glass rod to the silk
When a dielectric is inserted between the plates of a charged capacitor (battery disconnected), the potential difference across the plates: (1) Increases (2) Decreases (3) Remains the same (4) Becomes zero
Which of the following best describes a dielectric material? (1) A material that conducts electricity (2) A material that increases the capacitance of a capacitor (3) A material that decreases the electric field between capacitor plates (4) Both 2 and 3
Which of the following is NOT a dielectric material? (1) Rubber (2) Air (3) Copper (4) Mica
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 dielectric constant of vacuum is exactly __________.
The force per unit charge experienced by a small positive test charge placed in an electric field is called __________.
The relative permittivity (dielectric constant) of a material is always greater than or equal to 1. True or False?
True or False: The electrostatic force between two charges is a non-contact force.
