A semicirxular wire of radius a having l...

A semicirxular wire of radius a having `lambda`as charge per unit length Is shown in the figure. Find the electric potential at the centre of the semicircular wire.

`(lamda)/(epsi_(0))`

`(lamda)/(4piepsi_(0)R)`

`(lamda)/(4epsi_(0))`

none of these

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