Two charged particles having charge `5 uC` each are joined by an insulating string of length 1 m and the system is placed on a smooth horizontal table. Find the tension in the string.

Two particles of equal masses m and m are connected by a light string of length 2l. A constant force F is applied continuously at the mid-point of the string, always along the perpendicular bisector of the straight line joining the two particles. Show that when the distance between the two particles is x, the acceleration of the particle is a = F/m = (x)/((1^2 - x^2) ^(1//2)

One end of a string of length t is connected to a particle of mass m and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v the net force on the particle (directed towards the centre) is : T is the tension in the string. [Choose the correct alternative].

A particle of mass 1 kg is whirled uniformly at the end of a string 2 m long.If the string makes 3 revolutins in 1.2 sec., find the tension in the string.

Three point charges, each having a charge +10 C are placed on the three cornes A, B and C of a square ABCD having each side of length sqrt8 m. Find the electric field at the centre of the square.

Two equal balls with equal positive charge q coulombs are suspended by two insuulating strings of equal length. What would be the effect on the force when a plastic sheet is ineserted between the two?

A small ball of mass 2 xx 10^-3 kg, having a charge 1 mu C, is suspended by a string of length 0.8 m. Another identical ball having the same charge is kept at the point of suspension. Determine the minimum horizontal velocity that should be imparted to the lower ball so that it can make a complete revolution.

A particle of mass 14 g attached to a string of 70 cm long is rotated in horizontal circle. If the period of revolution is 2 sec, find the tension in the string.

A charged particle having a charge of -3muC is placed close to a sheet of charge having a surface charge density 5xx10^-6 Cm^-2 . Find the force of attraction between the particle and the sheet of charge.

Two bodies of masses 10 kg and 20 kg respectively kept on a smooth, horizontal surface are tied to the ends of a light string, a horizontal force F = 600 N is applied to:-B along the direction of string. What is the tension in the string in each case?

A ball of 0.03 m diameter and 0.3 kg in weight is attached to the end of a thin string of 0.46 m length. If it is rotate uniformly in a horizontal circle at the rate of 15 revolutions per second, what is the tension in the string? Take pi^2 = 9.87 ).