Physics - Electrostatics Question with Solution | TestHub
A spherical metallic conductor has a spherical cavity. A positive charge is placed inside the cavity at its centre. Another positive charge is placed outside it. The conductor is initially electrically neutral.
List - I | List - II |
|---|---|
(P) If outside charge is shifted to other position | (1) distribution of charge on inner surface of cavity changes. |
(Q) If inside charge is shifted to other position within cavity | (2) distribution of charge on outer surface of conductor changes. |
(R) If magnitude of charge inside cavity is increased | (3) electric potential at centre of conductor due to charges present on outer surface of conductor changes. |
(S) If conductor is earthed | (4) force on the charge placed inside cavity changes. |
(5) No changes occur. |
Options:
Answer:
Solution:
External-charge motion changes only outer-surface distribution.
Moving the cavity charge changes inner distribution, outer distribution and force on the inside charge as listed.
Increasing the cavity charge changes inner/outer distributions and outer-surface potential contribution.
Earthing changes outer distribution and outer-surface potential contribution.
The resulting code is option B.
