A charge having magnitude Q is divided into two parts q and (Q-q) . If the two parts exerts a maximum force of repulsion on each other, then find the ratio Q/q.

A mass is divided into two parts so that the force of gravitation between them is maximum. Find the ratio of the masses of the two parts.

The force acting between two point charges q_1 and q_2 kept at the same distance apart in air is attractive or repulsive when q_1q_2 > 0 .

The force acting between two point charges q_1 and q_2 kept at the same distance apart in air is attractive or repulsive when q_1q_2<0 .

Three charges -q, Q and -q are placed at equal distances on a striaght line. If the potential energy of the system of three charges is zero, then what is the ratio of Q:q?

Lorentz Force: If a charge +q is moving in an electric field E, it experiences a force qE called Lorentz electric force.If the charge q is moving in a magnetic field vecB , it experiences a force (vecvxxvecB) called Lorentz magnetic force. If charge q is moving in a n electric field E as well as in magnetic field vecB simultaneously, the total force experience by the charge is the sum of these two forces and is called total Lorentz force. If vecv and vecB are inclined to each other, the charged particle moves in a

In figure, two positive charges q_2 and q_3 fixed along the y-axis, exert a net electric force in the + x direction on a charge q_1 fixed along the x-axis. If a positive charge Q is added at (x,0), the force of q_1 .

Two parallel metal plates having charge +Q and -Q face each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the uniform electric field between the plates will