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harini_5
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Homework Statement
A spherical shell of radius R with uniform charge Q is expanded to a radius H.find the work done by electric forces during the shell expansion
given answer is 1/(8pi epsilon) *Q^2(1/R-1/H)
my attempt
work=-change in P E
=Q(V1-V2)
=1/(4pi epsilon) *Q^2(1/R-1/H)
please explain the additional 1/2 factor