The four charges -q, -2q, -q, and 4q are placed on four verticers A,B,C and D of a square respectively. Calculate the dipole moment of the system

Q.

Four short dipoles each of dipole moment p are placed at the vertices of a square of side a. The direction of the dipole moments are shown in the figure.

Q. Four small identical bar magnets each of magnetic dipole moment 'M' are placed on vertices of a square of side 'a' such that diagonals of the square coincide with perpendicular bisector of respective magnets. The net magnetic field at the centre of the square is

Q. Four spheres, each of mass m and radius r, are placed with their centers on the four corners of a square side b. Calculate the moment of inertia of the system about one side of square taken as it's axis?

Q. Four equal electric charges are arranged at the four corners of a square of side $a$. Out of these four charges, two charges are positive and placed at the ends of one diagonal. The other two charges are positive and placed at the ends of the other diagonal. The energy of the system is:

Q. Four spheres, each of radius a and mass m, are placed with their centre on four corners of a square of side b. Calculate the moment of inertia of the arrangement about any side of the square.