Force Between The Plates Of A Parallel Plate Capacitor

The force between the plates of a parallel plates capacitor of area A, capacitance C and having charge of will be

As the distance between the plates of a parallel plate capacitor decreased

As the distance between the plates of a parallel plate capacitor decreased

A small conducting sphere is hanged by an insulating thread between the plates of a parallel plate capacitor as shown in figure. The net force on the sphere is

The expression for the capacity of the capacitor formed by compound dielectric placed between the plates of a parallel plate capacitor as shown in figure, will be (area of plate = A )

How capacitance changes if the distance between the plates of a parallel plate capacitor is halved?