When air is replaced by a dielectric medium of dielectric constant K, the maximum force of attraction between two charges separated by a distance ?
A body can be negatively charged by
Four charges are placed at the corners of a square ABCD as shown in figure. The force on the charge kept at the centre O is:
Four charges as shown in figure are placed at the corners of a square of side a. What is the ratio (Q / q) if net force on Q is zero ?
A charge q is placed at the centre of the line joining two exactly equal positive charges Q. The system of three charges will be in equilibrium if q is equal to
Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)
Charges 4Q, q and Q are placed along X-axis at positions x = 0 x = l / 2 and x = l respectively. Find the value of q so that the force on charge Q is zero.
