A disk of radius R has a uniform surface charge density o. 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 (Fig. 23.4). Figure 23.4 (Example 23.3) A uniformly charged disk of dq radius R. The electric field at an axial point Pis directed along the central axis, perpendicular to the plane of the disk. R dr

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The electric field along the axis of a uniformly charged disk of radius R and total charge Q was calculated the given example. Show that the electric field at distances x that are large compared with R approaches that of a particle with charge Q = σπR2. Suggestion: First show that x/(x2 + R2)1/2 = (1 +
R2/x2)-1/2 and use the binomial expansion (1 + δ)n ≈ 1 + , when δ << 1.

A disk of radius R has a uniform surface charge density o. 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 (Fig. 23.4).
Figure 23.4 (Example 23.3)
A uniformly charged disk of
dq
radius R. The electric field at an
axial point Pis directed along
the central axis, perpendicular
to the plane of the disk.
R
dr
Transcribed Image Text:A disk of radius R has a uniform surface charge density o. 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 (Fig. 23.4). Figure 23.4 (Example 23.3) A uniformly charged disk of dq radius R. The electric field at an axial point Pis directed along the central axis, perpendicular to the plane of the disk. R dr
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