Current Electricity

A Wheatstone bridge is initially balanced at room temperature, with all four resistors having equal resistance ( 𝑅 1 = 𝑅 2 = 𝑅 3 = 𝑅 4 ) . When resistor 𝑅 3 ​ is heated, its resistance increases by 10%. Determine the potential difference ( 𝑉 𝑎 − 𝑉 𝑏 ) after heating, given that a 40 V battery is connected across the bridge.