Three concentric rings and one point charge are in the same plane as shown in th

Question

Three concentric rings and one point charge are in the same plane as shown in the above diagram. The linear charge densities of the rings are ?1 = 2.90nC/m, ?2 = -1.30nC/m, and ?3 = 2.30nC/m with corresponding radii of r1 = 92.0cm, r2 = 69.0cm, and r3 = 51.0cm. The point charge at the center of the rings has a net charge of q = -3.20nC. What is the magnitude of the electric field at a point along the axis that runs through the center of the rings, which is a distance a = 2.90m away from the center of the rings?

Explanation / Answer

2k(1r1/R1^2 +2r2/R2^2 +3r3/R3^2)

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