Four point masses, each of mass m, are arranged in the xy-plane at the points (0,0), (a,a),(a,- a) and (2a, 0) respectively . What is the moment of inertia of this array of masses about y-axis?

Two charges -q and +q are located at points (0,0,-a) and (0,0,a) respectively. (a) What is the electrostatic potential at the points (0,0,z) and (x,y,0) ?

S_(1) and S_(2) are the two coherent point sources of light located in the xy-plane at points (0, 0) and (0 , 3lamda) respectively. Here lamda is the wavelength of light. At which one of the following points (given as coordinates), the intensity of interference will be maximum?

Which axis the points such as (0,x) (0,y) (0,2) and (0,-5) lie on? Why?

From a circular disc of radius R and mass 9 M , a small disc of mass M and radius ( R)/(3) is removed concentrically. What will be the moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through the centre?

Moment of inertia of a circular wire of mass m and radius r about its diameter is

From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre?

Four identical point masses , each of mass m and carrying charge +q are placed at the comes of a square of sides a' on a frictionless plain surface .If the particles are released simulataneously ,the kinetic energy of the system when they are infinitcly far apart is