Draw the outline of different size of bangles and try to find out centre to each using set square.

Four identical spheres each of mass m are placed at the corner of square of side 2 m. Taking the point of intersection of the diagonals as the orgin the coordinates of the centre of mass are ?

Five balls of different color are to be placed in three boxes of different size. Each box can hold all five. In how many different ways can we placed the balls so that no box remains empty?

Four particles each of mass 'm' are kept at the four corners of a square of edge 'a'. Find the moment of inertia of the system about a line perpendicular to the plane of the square and passing through the center of the square.

Four charges, each of value q, are placed at the four corners of a square of side a. What is the potential at the centre of the square

Four identical thin rods each of mass M and length l , from a square frame. Moment of intertia of this frame about an axis through the centre of the square and perendicular to its plane is :

Draw a circle with radius 3.4 cm. Draw tangent to the circle, passing through point B on the circle, without using centre.

Four point charges -Q,-q,2q and 2Q are placed , one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is :

Two wires both of length are formed into (1) a circle and (2) a square . Each one carries a current i,Show that the magnetic field at the centre produced by the square is greater that that produced by the circle.

Four long, straight wires, each carrying a current of 5.0 A, are placed in a plane as shown in figure . The points of intersection form a square of side 5.0 cm. (a) Find the magnetic field at the centre P of the square. (b) Q_1, Q_2, Q_3 and Q_4 are points situated on the diagonals of the square and at a distance from P that is equal to the length of the diagonal of the square. Find the magnetic fields at these points.