The force of attraction between the plates of a parallel plate capacitor is

$A$ large cloud of size $5 \, km \times 5 \, km$ is hovering over the Earth at a height of $1 \, km$. Assuming the cloud and the Earth form a parallel plate capacitor with air as the dielectric,calculate the capacitance of the cloud-Earth system in $\mu F$.

The insulated plates of a charged parallel plate capacitor (with small separation between the plates) are approaching each other due to electrostatic attraction. Assuming no other force to be operative and no radiation taking place,which of the following graphs approximately shows the variation with time $(t)$ of the potential difference $(V)$ between the plates?

The diameter of each plate of an air capacitor is $4\,cm$. To make the capacity of this parallel plate capacitor equal to that of a sphere of diameter $20\,cm$,the distance between the plates will be:

$A$ capacitor is connected to a battery. What happens to the force of attraction between the plates when the separation between them is halved?

In a parallel plate capacitor,the capacity increases if