Answer:
Select a Gaussian
surface inside the conductor but very, the surface of the conductor
(a)
There is no electric field conductor so electric flue Gaussian surface is zero
or in words net charge inside Gaussian surface is zero. Then it can be said
that the charge lies outside the Gaussian surface i.e. on the outer surface of
the conductor.
(b)
Charge inside the cavity
will induce a charge on the inner side
of cavity and thus will appear on
outer surface. Thus total charge will be .
(c)
The instrument should be enclosed in a metallic shell so that the effect of
electrostatic field is cancelled out.
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