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three well separated conducting spheres of radii 2.5,4cm, and 6.5cm are charged to .04uC, 0.55 uC and 0.3 uC respectively.

a) Calculate the voltage at the surface of each sphere(assume a zero voltage at infinity) hint: outside the surface, charged spheres behave like pt charges.

b)now assume all three spheres are connected by wires. Calculate the new charges on each sphere

hint: continuous metallic surface are equipotential surfaces.

Thats the problem I have to solve

my soultion so far

a)v=kq/r

for sphere 1: V=(8.99x10*9)(0.4uC)/(.025m)=1.43x10*11

For Sphere 2: V=(8.99x10*9)(.55uC)/(.04m)=1.23x10*11

For Sphere 2: V=(8.99x10*9)(.3uC)/(.065m)=4.15x10*9

b)for all use the formula q/r?

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# Help! 3 well separted conductin spheres

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