Four equal positive charge are fixed at the vertical of a square of side L. Z-axis is perpendicular to plane of the square. The point `Z=0` is the other. The plot of electic field due to the charges, as one moves on the Z-axis is

Four point charges are placed at the corners of a square of side l. Calculate potential at the centre of square.

Four identical charges q are placed at the corners of a square of side a. Find the potential energy of one of the charges due to the remaining charges. .

Point charge q s placed at a point on the axis of a square non-conducting surface. The axis is perpendicular to the square surface and is passing through its centre. Flux of electric field throught he square caused due to charged q is phi . If the square is given a surface change of uniform density sigma , find the force on the square surface due to point charge 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 in

Four point positive charges are held at the vertices of a square in a horizontal plane. Their masses are 1kg, 2kg, 3kg, & 4kg . Another point positive charge of mass 10 kg is kept on the axis of the sqaure. The weight of their fifth charge is balanced by the electrostatic force due to those four charges. If the four charge on the vertices are released such that they can freely move in any direction(vertical, horizontal etc.) then the acceleration of the centres of mass of the four charges immediately after the release is (Use g= 10m//s^(2) )

Two equal negative charges are fixed at points and on y-axis. A positive charge Q is released from rest at the point on the x-axis. The charge Q will:

Two equal positive charges Q are fixed at points (a, 0) and (-a,0) on the x-axis. An opposite charge -q at rest is relased from point (0, a) on the y-axis. The charge -q will

Two positive charges of magnitude q are placed at the ends of a side ( side 1) of a square of side 2a . Two negative charges of the same magnitude are kept at the other corners . Staring from rest , n a charge Q moves from the middle of side 1 to the centre of square , its kinetic energy at the centre of square is -.

Moment of inertia of a square plate of side l about the axis passing through one of the corner and perpendicular to the plane of square plate is given by :