Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting
The system can never be in equilibrium
The system will be in equilibrium if the charges rotate about the centre of the triangle
The system will be in equilibrium if the charges have different magnitudes and different signs.
The system will be in equilibrium if the charges have the same magnitudes but different signs
A charge $q$ is placed in the middle of a line joining the two equal and like point charge $Q$. This charge $q$ will remain in equilibrium for which value of $q$ is
Two identical balls having like charges and placed at a certain distance apart repel each other with a certain force. They are brought in contact and then moved apart to a distance equal to half their initial separation. The force of repulsion between them increases $4.5$ times in comparison with the initial value. The ratio of the initial charges of the balls is
Select the correct alternative
Two spheres $A$ and $B$ of radius $4\,cm$ and $6\,cm$ are given charges of $80\,\mu c$ and $40\,\mu c$ respectively. If they are connected by a fine wire, the amount of charge flowing from one to the other is
A cube of side $b$ has a charge $q$ at each of its vertices. The electric field due to this charge distribution at the centre of this cube will be