# HELP conducting sphere

1. Homework Statement

Show that the energy associated with a conducting sphere of radius R and charge q surronded by a vacuum is given by u=kq^2/(2R).

2. Homework Equations

3. The Attempt at a Solution

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Hootenanny
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i couldnt do anything. what is u ?where does it come from i dont understand :( pls help me and sorry for my english i dont know perfect english

CompuChip
Show that the energy u associated with a conducting sphere ... is given by $k q^2 / (2 R)$