Consider a uniformly charged ring in the xy plane, centered at the origin. The ring has radius a and positive charge q distributed evenly along its circumference. (Figure 1)
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Part A:
What is the magnitude of the electric field along the positive z axis?
(use k in your answer, where k = 1/(4πε₀))
E(z) = ____________
Part B:
Imagine a small metal ball of mass m and negative charge -q_0. The ball is ...