A parallel plate capacitor with air between plates (dielectric constant K =2) has a capacitance C. If the air is removed, then capacitance of the capacitor is

Options

A. `(C)/(sqrt2)`
B. `(C)/(2)`
C. `sqrt2C`
D. 2C

Answer

B

Explanation

The capacity of parallel plate capacitor is given by
`C=(epsilon_(0)A)/(d)`
When plates of capacitor are separated by a dielectric medium of dielectric constant K,
then `" "C_("medium")=KC_("air")`
`therefore" "C_("air")=(C_("medium"))/(K)=(C)/(2)`