A parallel plate condenser with oil (dielectric constant 2) between the plates has capacitance C. If oil is removed, the capacitance of capacitor becomes: [AIPMT 1999]

• A.  \[\sqrt{2}\,C\]
• B. 2 C
• C. \[\frac{C}{\sqrt{2}}\]
• D. \[\frac{C}{2}\]