Kirchhoff's Laws & Measuring Instruments question from JEE Main 2022 (26 Jul, Shift 2)

Answer: (a)

1. Bridge: top arms $3, 3$; bottom arms $6, 6$; $\frac{3}{3} = \frac{6}{6}$, so it is balanced and $5\ \Omega$ carries no current.
2. $R_{bridge} = \frac{6 \times 12}{6 + 12} = 4\ \Omega$
3. Total $= 4 + 2 = 6\ \Omega$, $I = \frac{6}{6} = 1$ A
4. So the answer is (a) 1 A.