A parallel plate capacitor with plates separated by air acquires `1 mu C` of charge when connected to a battery of `500 V`. The plates still connected to the battery are then immersed in benzene `[k = 2.28]`. Then a charge that flows from the battery is.

Options

A. `1.28*500 mu C`
B. `2.28*500 mu C`
C. `1//4 mu C`
D. `4.56 mu C`

Answer

A

Explanation

`Q_(0)=C_(0)V_(0),Q=CV_(0)=KC_(0)V_(0)`
`Delta Q=Q-Q_(0)=(K-1)C_(0)V_(0)`.