Charge Q is spread uniformly along the circumference of a circle of radius R. A point particle with charge q is placed at the center of this circle. The total force exerted on the particle can be calculated by Coulomb’* law:
A. just use R for the distance
B. just use 2R for the distance
C. just use 2πR for the distance
D. the result of the calculation is zero
E. none of the above
