The region in between charge `Q_1` and `Q_2` has three different media. Find out the force between `Q_1` and `Q_2` the total distance between the charges is r. Figure is given below

Two point charges q_1 and q_2 are such that q_1q_2 lt 0 . What is the nature of the force acting between the two charges?

Two point charges +q_1 and +q_2 are placed a finite distance 'd' apart. It is desired to put a third charge q_3 in between these two charges so that q_3 is in equilibrium. This is

Two large conducting spheres carrying charges Q_1 and Q_2 are brought close to each other. Is the magnitude of the force between them exactly given by (Q_1Q_2) /(4 pi epsilon_0r^2) where r is the distance between their centres ?

Three charges q,q and -q are kept in the three vertices of an equilateral triangle of side l. Find out the resultant force on each of the charges.

Four point charges -Q, -q, 2q and 2Q are placed, one at each comer of the square. The relation between Q and q for which the potential at the centre of the square is zero is.

A capacitor is given a charge q. The distance between the plates of the capacitor is d. One of the plates is fixed and the other plate is moved away from the other till the distance between them becomes 2d. Find the work done by the external force.

The forces P=1 dyn and Q = sqrt(3) dyn are mutually perpendicular. Find out the angle between the vectors (P+Q) and (P-Q) .

Two large conducting sphere carrying charges Q_(1) and Q_(2) are brought close to each other. Is the magnitude of the electrostatic force between them exactly given by Q_(1) Q_(2) //4pi in_(0) r^(2) , where r is the distance between their centres ?

Define surface density of electric charge. Two large conducting spheres carrying charges Q_(1) and Q_(2) are brought close to each other. Is the magnitude of the electrostatic force between them exactly given by (Q_(1)Q_(2))/(4 pi epsilon_(0)r^(2)) where r is the distance betwen their centres?

The electrostatic force between the metal plates of an isotated parallel plate capacitor C having a charge Q and area A, is