A charged particle moves in a uniform electric field between two oppositely charged parallel metal plates to calculate the force acting on the particle due to the electric field, which quantity is not required?
Correct answer: B. Particle speed
- A. Particle charge
- B. Particle speed
- C. Plate separation
- D. Potential difference between the plates
Explanation
The force on a charged particle in a uniform electric field is given by:Force = qEWhere the electric field E between two parallel plates is:E = V / dSo, to calculate the force, we need:Particle charge (q)Potential difference between the plates (V)Plate separation (d)The speed of the particle does not affect the electric force acting on it.
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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