
An ellipsoidal cavity is carved within a perfect conductor. A positive charge is placed at the centre of the cavity. The points are on the cavity surface as shown in the figure.



Important Questions on Electrostatics

The figure shows the current in a single-loop circuit with a battery and resistance (and wires of negligible resistance). Then find the order of following at the point and .
(a) The magnitude of the current,
(b) The electric potential, and
(c) The electric potential energy of the charge carriers (electron), the greatest first.


The magnitude of electric force on charge placed at the centre of two equilateral triangles each of side , as shown in the figure is . If charge and are respectively, then is:


Two-point charges of the same magnitude and opposite sign are fixed at points and . A third small point charge is to be balanced at point by the electrostatic force due to these two charges. The point

Two-point charges and whose magnitudes are the same are positioned at a certain distance from each other with at the origin. The graph is drawn between electric field strength at points between and and distance from . is taken positive if it is along the line joining from to . From the graph, it can be decided that

