The figure shows a nonconducting ring which has positive and negative charge non uniformly distributed on it such that the total charge is zero. Which of the following statements is true?
The potential at all the points on the axis will be zero.
The electric field at all the points on the axis will be zero.
The direction of electric field at all points on the axis will be along the axis.
If the ring is placed inside a uniform external electric field then net torque and force acting on the ring would be zero.
The two thin coaxial rings, each of radius $'a'$ and having charges $+{Q}$ and $-{Q}$ respectively are separated by a distance of $'s'.$ The potential difference between the centres of the two rings is :
Twenty seven drops of same size are charged at $220\, \mathrm{~V}$ each. They combine to form a bigger drop. Calculate the potential of the bigger drop. (In $\mathrm{~V}$)
Two insulated charged spheres of radii $20\,cm$ and $25\,cm$ respectively and having an equal charge $Q$ are connected by a copper wire, then they are separated
Equal charges are given to two spheres of different radii. The potential will
Calculate potential on the axis of a disc of radius $R$ due to a charge $Q$ uniformly distributed on its surface.