Question

When a charge of amount Q is given to an isolated metal plate X of surface area A, its surface charge density becomes σ₁. When an isolated identical plate Y is brought close to X, the surface charge density on X becomes σ₂. When Y is earthed, the surface charge density becomes σ₃. 

(a) σ₁ = Q/A

(b) σ₁ = Q/2A

(c) σ₁ = σ₂

(d) σ₃ = Q/A

Answer 1

Correct Answer is: (b) σ₁ = Q/2A ,(c) σ₁ = σ₂ ,(d) σ₃ = Q/A