Three cahrges each+q, are placed at the ...

Three cahrges each`+q`, are placed at the corners of an isosceles trinagle `ABC` of sides `BC` and `AC, 2a, D` and `E` are the mid-points of `BC` and `CA`. The work done in taking a charge `Q` from `D` to `E` is

zero

`(3qQ)/(4 piepsilon_(0)a)`

`(3qQ)/(8 piepsilon_(0)a)`

`(qQ)/(4 piepsilon_(0)a)`

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