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## Homework Statement

If a spherical raindrop of radius 0.800 mm carries a charge of -1.50 pC uniformly distributed over its volume, what is the potential at its surface?

Two identical raindrops, each with radius and charge specified in part (A), collide and merge into one larger raindrop. What is the radius of this larger drop, if its charge is uniformly distributed over its volume?

## Homework Equations

[tex] V = \frac {K*q} {r} [/tex]

## The Attempt at a Solution

I tried:

[tex] V = \frac {(\frac {1} {4*pi*(8.85*10^{-12}})*-1.50} {0.008} [/tex]

The online program says I'm off by an additive constant, I'm not sure if I'm using pC value correctly, I've never seen that unit before in our lectures.