A spherical shell of radius `R_(1)` with uniform charge q is expanded to a radius `R_(2)`. Find the work performed by the electric forces in this process.

A spherical shell of radius `R_(1)` with uniform charge q is expanded

1.	A spherical shell of radius `R_(1)` with uniform charge q is expanded to a radius `R_(2)`. Find the work performed by the electric forces in this process.
Answer» As the field is conservative total work done by field force, `A_(fd) = U_(i) - U_(f) = (1)/(2) q (varphi_(1) - varphi_(2))` `= (1)/(2) (q^(2))/(4pi epsilon_(0)) [(1)/(R_(1)) - (1)/(R_(2))] = (q^(2))/(8pi epsilon_(0)) [(1)/(R_(1)) - (1)/(R_(2))]`

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A spherical shell of radius `R_(1)` with uniform charge q is expanded to a radius `R_(2)`. Find the work performed by the electric forces in this process.

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