Which of the following fields does not affect the velocity of a charged particle?
Correct answer: B. Magnetic
- A. Electric
- B. Magnetic
- C. Electrostatic
- D. None of above
Explanation
A magnetic field does not do any work on a charged particle thus has no effect on the velocity of a charged particle. The magnetic field does zero work on a charged particle because it's always normal to the particle trajectory. Work equals the change in kinetic energy, and when there won't be a change in kinetic energy due to work being zero there won't be a change in the speed of a particle.
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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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