1 Method of Images 1. Write down the potential V(x, y, z) due to a point charge q at z = 2, and q, at z = z, (assume z, > 2; for your diagram).

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1 Method of Images
1. Write down the potential v (2, y, z) due to a point charge q; at z = z; and q.
at z = z. (assume z, > 2; for your diagram).
2. Show that the choices of q = -q.(R/z,) and z, = R2/z, give v (r = R) = 0. That
is, with these choices for q and z,, this potential is zero on a sphere
centered on the origin and with a radius R.
Once you have found v(z, y, 2) due this two-charge problem, you have
solved another problem: The potential due to a point charge outside of
a grounded (v = 0) conducting sphere of radiusR that is centered on the
origin. The boundary conditions for the conductor problem is that v is
zero on the surface of the sphere and approaches zero as r → ∞. The v
for the two-charge problem matches these boundary conditions and so
the two-charge v must be the same as the v for the conductor problem.
Transcribed Image Text:1 Method of Images 1. Write down the potential v (2, y, z) due to a point charge q; at z = z; and q. at z = z. (assume z, > 2; for your diagram). 2. Show that the choices of q = -q.(R/z,) and z, = R2/z, give v (r = R) = 0. That is, with these choices for q and z,, this potential is zero on a sphere centered on the origin and with a radius R. Once you have found v(z, y, 2) due this two-charge problem, you have solved another problem: The potential due to a point charge outside of a grounded (v = 0) conducting sphere of radiusR that is centered on the origin. The boundary conditions for the conductor problem is that v is zero on the surface of the sphere and approaches zero as r → ∞. The v for the two-charge problem matches these boundary conditions and so the two-charge v must be the same as the v for the conductor problem.
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