Two thin infinite parallel plates have uniform charge densites +σ and -σ , the electric field in the space between them is:
Correct answer: C. σ /ϵ0
- A. σ /2ϵ0
- B. σ
- C. σ /ϵ0
- D. Zero
Explanation
According to Gauss's Law, for two infinite parallel plates with uniform charge densities +σ and -σ, the electric field between them is given by σ/ϵ0. The field is directed from the positively charged plate to the negatively charged plate. Option C is correct because it correctly applies Gauss's Law to the scenario described. Option A describes the field from a single plate, Option B omits the permittivity factor, and Option D incorrectly suggests the field is zero between the plates.
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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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