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

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