Two thin rings each of radius R are plac...

Two thin rings each of radius R are placed at a distance 'd' apart. The charges on the rings are +q and -q. The potential difference between their centres will be -

`Q/(2piespi_0)[1/a-1/(sqrt(s^2+a^2))]`

`Q/(2piespi_0)[1/a+1/(sqrt(s^2+a^2))]`

`Q/(4piespi_0)[1/a-1/(sqrt(s^2+a^2))]`

`Q/(4piespi_0)[1/a+1/(sqrt(s^2+a^2))]`

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