Four charges `+Q, -Q, +Q, -Q` are placed at the corners of a square taken in order. At the centre of the square

Four idential charges each of charge q are placed at the corners of a square .Then at the centre of the square the resultant electric intensity E and the net electric potential V are

Four charges Q-Q, Q-Q are placed at the corners of a square as shown . The potential is zero at points

Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is

Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium , the value of q is

Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is

Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is

Four charges equal to -Q are placed at the four corners fo a square and a charge q is at its centre, If the system is in equilibrium the value of q si

Four charges each of -Q , are placed at the four corners of a square. Find out the value of a charge q placed at the centre of the square, such that all the charges would be at equilibrium.