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 10
A charged rod is brought near small pieces of paper, and the paper is attracted to the rod. Explain why this happens.
A glass rod is rubbed with silk. The glass rod becomes positively charged. What type of charge does the silk acquire?
A metal sphere is given a positive charge. What happens to the electrons in the sphere?
A plastic rod is rubbed with a wool cloth and becomes negatively charged. What happens to the wool cloth?
Calculate the electrostatic force between two charges of +2 μC and -3 μC placed 0.5 m apart in air. (Coulomb's constant k = 9 × 10^9 N·m²/C²)
Calculate the force between two charges of +1 μC and +1 μC separated by 1 m in air. (k = 9 × 10^9 N·m²/C²)
Define dielectric material.
Describe the difference between a conductor and an insulator in terms of electron movement.
Describe what happens to the electrons in a conductor when it is placed in an electric field.
Describe what is meant by the term 'electrostatic equilibrium' in a conductor.
Explain what happens when a dielectric is placed between the plates of a charged capacitor.
Explain why a charged balloon can stick to a wall after being rubbed on hair.
Explain why metals are good conductors of electricity.
Explain why static electricity is more noticeable on dry days than on humid days.
