A parallel plate condenser with oil (dielectric constant K = 2) between plates has capacitance C. If oil is removed, capacitance of the capacitor becomes:
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A parallel plate condenser with oil (dielectric constant K = 2) between plates has capacitance C. If oil is removed, capacitance of the capacitor becomes:

G1 Physics · Accepted Answer

Step 1: With full dielectric, Cₖ = Kε₀A/d. Step 2: Removing oil gives C₀ = ε₀A/d = Cₖ/K. Step 3: With K = 2 and original Cₖ = C, result C₀ = C/2.