A particle with charge Q coulomb, tied at the end of an inextensible string of length R metre, revolves in a vertical plane. At the centre of the circular trajectory, there is a fixed charge of magnitude Q coulomb . The mass of the moving charge M is such that `Mg=Q^2/(4pivarepsilon_0R^2)`. If at the highest position of the particle, the tension of the string just vanishes, the horizontal velocity at the lowest point has to be

A particle with charge Q coulomb, tied at the end of an inextensible string a length R meter, revolves in a vertically plane. At the centre of the circular trajectory there is a fixed charge of magnitude Q coulomb. The mass of the moving charge M is such that Mg=(Q^(2))/(4pi epsi_(0)R^(2)) if at the highest position of the partical the tnesion of the string just vanishes, the horizontal velocity at the lowest point base to the

A particle with charge QC, tied at the end of an inextensible string of length R metre, revolves in a vertical plane. At the centre of the circular trajectory there is a fxied charge of magnitude QC. The mass of the moving charge M is such that Mg=(Q^(2))/(4pi epsi_(0)R^(2)) . If at the highest position of the particle, the tenstion of the string just vanishes, the horizontal velocity at the lowest point has to be

A charge q coulomb moves in a circle at n revolution per second and the radius of the circle is r metre. Then magnetic feild at the centre of the circle is

A charge q coulomb moves in a circle at n revolution per second and the radius of the circle is r metre. Then magnetic feild at the centre of the circle is

A charge q coulomb ,moves in a circle of radius r metres, at n revolutions per second.The magnetic field induction at the centre of the circle will be

A particle of mass m is tied to a string of length L and whirled into a horizontal plan. If tension in the string is T then the speed of the particle will be :

A particle of mass m is tied to a string of length L and whirled into a horizontal plan. If tension in the string is T then the speed of the particle will be :

Two points charges are placed on x-axis as shown, a = 1 cm, q = 1muC , mass of each particle m=6g . The charges are tied at the end of an inextensible string of length 2a. The whole system is free to move on a horizontal frictionless surface. Now suppose a third charge of equal value +q is fixed at the point (a//2,0) and the system of charges A and B is released. There is no friction between third charge and string. Find the maximum velocity of the system of charges A and B.

A particle of mass m attached to an inextensible light string is moving in a vertical circle of radius r. The critical velocity at the highest point is v_( 0) to complete the vertical circle. The tension in the string when it becomes horizontal is