Zero field exists inside the cavity of a conductor. As the charge resides on the outer surface of a conductor irrespective of the shape/size of the conductor and the field inside the cavity of the is always zero .
Q. What total charge is on the inner surface of the spherical shell?
Since the Electric field vanishes everywhere inside the volume of a good conductor, its value is zero everywhere on the Gaussian surface we have considered. So the surface integral is zero. This is the total charge induced on the inner surface.
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Q. What is the charge inside a conductor?
The electric field is zero inside a conductor. Just outside a conductor, the electric field lines are perpendicular to its surface, ending or beginning on charges on the surface. Any excess charge resides entirely on the surface or surfaces of a conductor.
Q. Is the electric field inside a cavity?
The electric field lines from the charge(s) inside the cavity connect to the induced surface charges, in a similar way the outer surface charges of the conductor radiate and terminate at some other faraway charge. Recall that electric field is only necessarily zero in the non-surface ‘flesh’ of a conductor.
Q. Is the potential in the cavity of charged conductor zero?
Yes, zero field exists inside the cavity of charged conductor.
Q. What is a cavity in electrostatics?
The use of the principle can be illustrated on the following electrostatic example. Sphere of radius with an empty, spherical cavity of a radius , has a positive volume charge density The center of the cavity is at the distance. from the center of the charged sphere (Figure 1).
Q. Is the electric field inside a cavity zero?
If instead the conductor had an interior cavity, the charges would again distribute themselves on the outer surface in order to eliminate the electric field on the inside material of the conductor. (Free electrons cannot move in equilibrium.)
