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AP Physics C: E&M
8.4 Electric Fields of Charge Distributions
AdvancedMCQMathematical17.2k
A 2D schematic in the xy-plane showing a thin spiral wire starting at polar angle \theta = \pi on the negative x-axis at radius r = b\pi and winding counterclockwise to angle \theta = 2\pi on the positive x-axis at radius r = 2b\pi. The origin (0,0) is marked with a black dot labeled (0,0). The spiral wire is labeled with charge density \lambda_0. A small segment dq on the spiral at an arbitrary angle \theta in the third quadrant is highlighted, with a position vector \vec{r} pointing from the origin to dq labeled r = b\theta. An electric field vector d\vec{E} originates at (0,0) and points opposite to \vec{r}. Dashed coordinate axes x and y are shown. No other labels, lines, or text appear.
Planar spiral wire in the xy-plane carrying charge density \(\lambda_0\).
A thin, nonconducting wire carrying a uniform positive linear charge density \(\lambda_0\) is bent into a planar spiral described in polar coordinates by \(r(\theta) = b\theta\) for \(\pi \le \theta \le 2\pi\), where \(b\) is a positive constant. The spiral lies in the \(xy\)-plane with the origin \((0,0)\) located at \(r = 0\). Which of the following expressions correctly represents the integral set up to determine the \(y\)-component of the net electric field, \(E_y\), at the origin?

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