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A disk of radius R has a uniform surface charge density σ. Calculate the electric field at a point P that lies along the central perpendicular axis of the disk and a distance x from the center of the disk (as shown).

dq
R
P
Figure 23.4 (Example 23.3)
A uniformly charged disk of
radius R. The electric field at an
dr
axial point Pis directed along
the central axis, perpendicular
to the plane of the disk.

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