Four charges are arranged at the corners of a square as shown in the figure. The direction of electric field at the centre of the square is along :
Four charges q, 2q, 3q and 4q are placed at corners A, B, C and D of a square as shown in the figure below. Find the direction of electric field at the centre P of the square.
Four charges are arranged at the corners of a square ABCD as shown in the figure. If a test charge is placed at the centre, calculate the direction of net force on that charge.