Obtain the condition for bridge balan in Wheatstone's bridge. (PIA,Sep-20,Jaly-2

In Wheatstone's bridge, the condition for balance is given by the equation: \[ \frac{R_1}{R_2} = \frac{R_3}{R_4} \] where: - \( R_1 \) and \( R_2 \) are the resistances in the first leg of the bridge, - \( R_3 \) and \( R_4 \) are the resistances in the second leg of the bridge. This condition ensures that the bridge is balanced, meaning that the voltage across the galvanometer is zero.