The unit of energy density of an electric field is:
Correct answer: B. Jm⁻³
- A. JC⁻¹
- B. Jm⁻³
- C. JV⁻¹
- D. JF⁻³
Explanation
Energy density is defined as energy per unit volume. The SI unit for energy is the Joule (J) and for volume is cubic meters (m³), making the unit of energy density Joules per cubic meter (J/m³).
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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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