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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 17 - Electric Charge and Field > Three charges (each Q) are placed at the three corners of an equilateral triangle. A fourth charge q is placed at the center of the triangle. The ratio ∣q/Q∣ so as to make the system in equilibrium is:

Three charges (each Q) are placed at the three corners of an equilateral triangle. A fourth charge q is placed at the center of the triangle. The ratio ∣q/Q∣ so as to make the system in equilibrium is:

It is required to hold equal charges q in equilibrium at the corners of a square. What charge when placed at the centre of the square will do this?