Two parallel plate air capacitance `C`, were connected in series to a battery with `emf xi`. Then one of the capacitors was filled up with uniform dielectric with permittivity `epsilon`. How many times did the electric field strength in that capacitor decrease ? What amount of charge flows throgh the battery ?

Options

A. ` Deltaq =(1)/(2) CE (k+1)/( k-1) `
B. ` Delta q= (1)/(2) CE (k-1)/( k+2) `
C. ` Delta q= (1)/(2) CE ( k -1)/( k+1) `
D. none of these

Answer

B