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Both the replies agree that the charge distribution on the outer surf=
ace
will be uniform. However, I still have some questions: =20
1. If the point charge inside is +q will the total charge on the oute=
r
surface be +q (and the charge on the cavity wall be -q)?
2. Assume that the point charge is close to the cavity surface. Now=
if
we increase the radius of the sphere (keeping the point charge at the
same distance from the cavity surface) the charge density on the oute=
r
surface will decrease (right?) When the radius becomes infinity the p=
art
of conducting sphere close to the point charge becomes a conducting
plate. The E-field on the other side of the plate will become ZERO
because the charge density on the plate will be zero! Is that corre=
ct?