usually a drop is in spherical shape due to the surface tension but if it is given a charge gradually  then what will be the effect on the shape and size of the drop ?

what will happen if the charge given  Q tends to infinity?

The size of drop will increase due to repulsion between like charges

Shape will remain same.

it expands due to mechanical force per unit area given by

F=1/2 (permittivity)* (electric intensity)^2

It has been proven that this force exists by depositing charge on a soap bubble which expanded due to this force

but friends u all have left the 2nd part that what will happen when the charge Q tends to infinity?

I know that the drop will explode but my confusin is that can we find the no of small drops formed after the explosion

obviously we cannot conserve energy as some energy will be lost as heat,wsound etc.

When we go on filling a baloon with a lot of air it bursts . Here the sound Energy comes from the Energy we applied to fill the balloon. So even Ithink in this case the Ener. applied to charge the baloon will come frm. the Ener. applied to fill it with charge 

not getting it man plz elucidate a bit more

Sorry !! I did a mistake. When we fill a big baloon it bursts. Sothe sound Energy in this case comes from the Energy we applied to fill the baloon. Even in this case I think the Energy produced due to bursting of bubble comes from the Energy which we applied to fill the bubble with charge.

but friend it is not about sound energy only some energy is also lost as heat energy to the surroundings

Heat Enegy is nothing but the K.E of molecules. So even I think that bursting of balloon has got K.E. Which can be applied in case of that charged drop.