- #1
gracy
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Homework Statement
A spherical drop of water carrying a charge of 3×10^-19 has a potential of 500V at its surface (with V=0 at infinity) (a) What is the radius of the drop? If two such drops of the same charge and radius combined to form a single drop, what is the potential at the surface of the new drop
Homework Equations
##V##=##\frac{q}{4πε0r}##
The Attempt at a Solution
Here q=3×10^-19 C and V=500 volts.
##r##=##\frac{3×10^-19×9×10^9}{500}##
=##\frac{27×10^-10}{5×10^2}##
=##\frac{27×10^-10×10^-2}{5}##
=##\frac{27×10^-12}{5}##
=5.4×10^-12
but the answer for r is wrong it should be r=0.54cm.What went wrong .