The electrical intensity inside a charged hollow sphere is | the electric intensity inside a charged hollow sphere is – 2017

the electrical intensity inside a charged hollow sphere is | the electric intensity inside a charged hollow sphere is
(a) Zero (b) Infinity
(c) Constant (d) Variable

The electric field inside a conductor is zero because of the inverse square law.
At any point inside, the forces acting in opposite directions are equal.

The forces in the direction of A1 and A2 are proportional to charge/distance2charge/distance2
The charges corresponding to A1 and A2 are proportional to the areas; and the areas are proportional d2d2. So therefore the forces are proportional to d2/d2d2/d2 for each, and they cancel.
Similarly, the gravitational field inside a gravitational shell is also zero.

https://www.quora.com/Why-is-the-electric-field-inside-a-uniformly-charged-spherical-shell-zero

https://www.quora.com/Why-is-the-electric-field-inside-a-conductor-zero