In this Question set, we will collect interesting questions related to conducting sphere from the electrostatics chapter, and also will post answers to the selected ones.
Conducting sphere – Questions (MCQ)
A hollow, conducting sphere is initially uncharged. A positive charge, +q1, is placed inside the sphere, as shown in the figure. Then, a second positive charge, +q2, is placed near the sphere but outside it. Which of the following statements describes the net electric force on each charge?
a) There is a net electric force on +q2 but not on +q1.
b) There is a net electric force on +q1 but not on +q2.
c) Both charges are acted on by a net electric force with the same magnitude and in the same direction.
d) Both charges are acted on by a net electric force with the same magnitude but in opposite directions.
e) There is no net electric force on either charge.
Inside a hollow conducting sphere, which is uncharged, a charge q is placed at its center. Let the electric field at a distance x from the center at point p be E and potential at this point be V. Now, some positive charge Q is given to this sphere, then
a) E will remain the same
b) E will increase
c) V will decrease
d) V will remain the same
Answers to Conducting sphere Questions
The correct answer to Q (1): Option D
Both charges are acted on by a net electric force with the same magnitude but in opposite directions.
The correct answer to Q (2): Option A
Explanation: The electric field produced due to the introduction of charge Q will be zero at P, Hence, E will remain the same at P (contributed by charge q only). But the potential produced by Q at P will not be zero. Hence, V won’t remain the same at P. V won’t decrease as well.