A charge +q is placed somewhere inside t...

A charge +q is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius `R_(1)` and outer radius `R_(2)`. A charge – Q is placed at a distance `r gt R_(2)` from the centre of the shell. Then the electric field in the hollow cavity-

depends on both +q and – Q

is zero

is only that due to -Q

is only that due to +q

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