A particle of mass m and `+q` is located midway between two fixed charged particles each having a charge `+q` and at a distance `2l` apart. Assuming that the middle charge moves along the line joining the fixed charges, show that the frequency of oscillation when it is displaced slightly is
`(q)/(2pi)sqrt((1)/(piepsilon_(0)ml^(3))`

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 point charges +4q and +q are placed 30 cm apart. The electric field intensity at a point on the line joining the two charges is zero. The point is situated at a distance

Two charges +q and -q are placed at a distance d form each other . At which points the direction of the resultant electric field is parallel to the line joining the two charges ?

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and -q . The potential difference between the centres of the two rings is

Four particles each having a charge q are placed on the four vertices of a regular pentagon. The distance of each corner from the centre is a. Find the electric field at the centre of the pentagon.

A particle of mass M and charge q is at rest at the midpoint between two other fixed similar charges each of magnitude Q placed a distance 2d apart. The system is collinear as shown in the figure. The particle is now displaced by a small amount x(x lt lt d) along the line joining the two charges and is left to itself. It will now oscillate about the mean position with a time period ( epsi_(0) = permittivity of free space)

Two point charges q_A=3muC and q_B=-3muC are located 20 cm apart in vacuum. What is the electric field at the midpoint of the line AB joining the two charges ?

Write the expression for the de Broglie wavelength associated with a charged particle having charge q and mass , when it is accelerated by a potential V.

The points on the line joining two charges +q and 3q (kept at a distance of 1.0 m) where electric potential is zero.