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AP Physics C: E&M
8.4 Electric Fields of Charge Distributions
IntermediateMCQGraphicalMathematicalConceptual13.6k
A perspective view of a thin circular ring drawn as a horizontal ellipse centered at the origin of a coordinate system. A dashed vertical line passes through the center of the ring and extends upward as a solid arrow labeled \(z\). An arrow extends from the center of the ring to its outer edge at an angle of 30 degrees above the horizontal, labeled \(R\). A plus sign labeled \(+Q\) sits just outside the upper-right rim of the ring. A single point labeled \(P\) is marked with a solid dot on the positive \(z\)-axis at a distance above the center. No other labels, lines, text, or axes appear.
A uniformly charged ring of radius \(R\) in the \(xy\)-plane.
A thin circular ring of radius \(R\) lies in the \(xy\)-plane centered at the origin and carries a total positive charge \(Q\) distributed uniformly along its circumference. Which of the following graphs best represents the electric field magnitude \(E\) on the positive \(z\)-axis as a function of the distance \(z\) from the center of the ring?

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