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A sperical shell is uniformly charged by...

A sperical shell is uniformly charged by a charge q. A point charge `q_(0)` is at its centre , then

A

The work done by electric forces upon the expansion of shell from radius `R_(1)` to `R_(2)` is
`( q(q_(0)+(q)/(2)))/(4pi epsilon_(0))((1)/(R _(1))-(1)/(R_(2)))`

B

Electric energy of system will decreased upon expansion

C

Electric energy of system will remain same upon expansion of shell.

D

The electric field and energy changes is localised only in spherical region of inner radius `R_(1)` and outer radius `R_(2)`

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