Consider a parallel plate capacitor of \[10\mu \,F\] (micro-farad) with air filled in the gap between the plates. Now one half of the space between the plates is filled with a dielectric of dielectric constant 4, as shown in the figure. The capacity of the capacitor changes to [AFMC 2001; MP PET 2001]

• A.            \[25\,\mu \,F\]
• B.            \[20\,\mu \,F\]
• C.            \[40\,\mu \,F\]
• D.            \[5\,\mu \,F\]