The capacity of a parallel plate condenser increases four times if the air between the plates is replaced by glass. The permittivity of glass will be

Options

A. `3.54xx10^(-11)C^(2)//Nm^(2)`
B. `3.54xx10^(-12)C^(2)//Nm^(2)`
C. `2.54xx10^(-11)C^(2)//Nm^(2)`
D. `2.22xx10^(-12)C^(2)//Nm^(2)`

Answer

A

Explanation

`C_(m)=C_("air")xxk" "thereforek=4`
`in=in_(0)k=8.85xx10^(-12)xx4`
`=3.54xx10^(-11)C^(2)//Nm^(2)`