Two thin wire rings each having a radius...

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coiciding. The charges on the two rings are `+q` and `-q`. The potential difference between the centres of the two rings is

Zero

`(q/4piepsilon_0){(1/R)-(1/sqrt(R^2 + d^2 ))}`

`qR/4piepsilon_0 d^2`

`(q/2piepsilon_0){(1/R)-(1/sqrt(R^2 + d^2 ))}`

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