Four equal masses (each of mass M) are placed at the corners of a square of side a. The escape velocity of a body from the centre O of the square is

Four equal masses (each of mass M) are placed at the corners of a squares side a the escape velocity of a body from the centre O of the square is

Three equal masses (each m) are placed at the corners of an equilateral triangle of side a'. Then the escape velocity of an object from the circumcentre P of triangle is

Three equal masses (each m) are placed at the corners of an equilateral triangle of side a . Then the escape velocity of an object from the circumcentre P of triangle is

Four charges, each of value q, are placed at the four corners of a square of side a. What is the potential at the centre of the square

Four particles each of mass m are placed at the vertices of a square of side l. the potential at the centre of square is

Four particles each of mass m are placed at the vertices of a square of side l. the potential at the centre of square is

Four identical charges each .q. are placed at four corners of a square of side .a.. Find the charge to be placed at the centre of the square so that the system of charges is in equilibrium