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 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 point where the diagonals of the square intersect each other. The plot of electic field due to the charges, as one moves on the Z-axis is

Four equal charges are kept fixed on the vertices of a square of side 'a'. A charge q_1 is kept at the centre of the square as shown in the figure . Then

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

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

Four equal point charges of 16 muC are kept at vertices of square of side 0.2 m. Find force acting at any one charge.

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. .

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. .

The perpendicular distance of the point (1,1,0) from the z-axis is -

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.