Two identicaln thin rings each of radius...

Two identicaln thin rings each of radius 10 cm carrying charges 10 C and 5 C are coaxially placed at a distance 10 cm apart. The work done in moving a charge q from the centre of the first ring to that of the second is

`(q)/(8piepsilon_(0)).[(sqrt(2)+1)/(sqrt(2))]`

`(q)/(8piepsilon_(0)).[(-sqrt(2)+1)/(sqrt(2))]`

`(q)/(4piepsilon_(0)).[(sqrt(2)+1)/(sqrt(2))]`

`(q)/(4piepsilon_(0)).[(sqrt(2)-1)/(sqrt(2))]`

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