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A parallel plate condenser with oil between the plates (dielectric constant of oil K = 2) has a capacitance C. If the oil is removed, then capacitance of the capacitor becomes .
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- √2C
- 2C
- C/√2
- C/2
Correct Option: D
When oil is placed between space of plates
| C = | ..........(i) |  | ∵ C = | , if K = 2 |  | ||
| d | d |
| When oil is removed C' = | ......(ii) | |
| d |
On comparing both equations, we get C ' = C/2
