A ball having a charge -100 e is placed at the centre of a hollow spherical shell which has a net charge of -20 e. What is the charge on the shell's outer surface?

Question

A ball having a charge -100 e is placed at the centre of a hollow spherical shell which has a net charge of -20 e. What is the charge on the shell's outer surface? (A) +80 e (B) -20 e (C) -100 e (D) -120 e

Tardigrade Admin · Accepted Answer

When charged ball is placed at the center of a ball it induces opposite charge on the inner. surface by the induction further same nature charge will induce on the outer surface of shell. Hence the total charge on the surface of shell is -100 e -20 e =-120 e <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/60f3ec721a0dc74cc56c21d5a2026202-.png" />

Q. A ball having a charge $- 100 e$ is placed at the centre of a hollow spherical shell which has a net charge of $- 20 e .$ What is the charge on the shell's outer surface?

$+ 80 e$

$- 20 e$

$- 100 e$

$- 120 e$

When charged ball is placed at the center of a ball it induces opposite charge on the inner. surface by the induction further same nature charge will induce on the outer surface of shell. Hence the total charge on the surface of shell is $- 100 e - 20 e$ $= - 120 e$

Q. A ball having a charge −100e is placed at the centre of a hollow spherical shell which has a net charge of −20e. What is the charge on the shell's outer surface?

+80e

−20e

−100e

−120e