A half ring of radius `r` has a linear charge density `lambda`.The potential at the centre of the half ring is

A half ring of radius `r` has a linear charge density `lambda`.The potential at the centre of the half ring is
A. `(lambda)/(4epsioln_(0))`
B. `(lambda)/(4pi^(2)epsilon_(0)r)`
C. `(lambda)/(4piepsilon_(0)r)`
D. `(lambda)/(4piepsilon_(0)r^(2))`

A half ring of radius `r` has a linear charge density `lambda`.The potential at the centre of the half ring is

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