How much of potential energy stored in conducting sphere

kyng
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Hi,
can anyone help me to solve this problem...

An isolated conducting sphere which radius R is 6.85cm has a charge q=1.25nc. Determine how much potential energy stored in conducting sphere?

I try to solve it but can't get the ans...the hint given is by using c=4(pi)ER
answer is =103nJ

thanks for helping
 
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kyng said:
An isolated conducting sphere which radius R is 6.85cm has a charge q=1.25nc. Determine how much potential energy stored in conducting sphere?
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