Six point charges of charge q are arranged uniformly around
     Six point charges (of charge q) are arranged uniformly around a circle of radius R in the x-y plane. What is the value of the electric potential at the center of the circle.  v = 0  V = 3q/2 pi epsilon_O R  V = 6q/pi epsilon_O R 
  
  Solution
here ,
at the centre of the circle
radius of the circle is r
six charges are placed
V = 6 * potential due to each charge
V = 6 * 1/(4pi * epsilon_0) * q/R
V = 3 * q/(2 * pi * epsilon_0 * R)
the correct option is b) 3 * q/(2 * pi * epsilon_0 * R)

