If a charge is moved against the Coulomb force of an electric field
Correct answer: B. Energy is used from some outside source
- A. Work is done by the electric field
- B. Energy is used from some outside source
- C. The strength of the field is decreased
- D. The energy of the system is decreased
Explanation
When a charge is moved against the Coulomb force of an electric field, energy has to be supplied from an external source to perform this work. Therefore, the correct option is (b).Incorrect options: (a) The electric field does not do work; instead, work is done on the system.(c) The strength of the electric field is not necessarily affected by the movement of a charge against it.(d) The energy of the system would actually increase due to the work done.
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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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