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There are three unchanged identical meta...

There are three unchanged identical metallic spheres `1,2 and 3` each of radius `r` and are placed at the verticles of an equlilateral triangle of side `d`.A charged metallic sphere having equal `q` of same radius `r` is touched to sphere `1` after some time it is taken to the location of sphere `2` and is touched to it ,then it is taken far away form sphere `1,2,3` after that the sphere `3` is grounded the charge on sphere `3` is (neglect electrostatic induction by assuming `d gt gt 2r)`

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