Question

\(\text{ The Wheatstone bridge is an arrangement of four resistances, say } R_1, R_2, R_3, \text{ and } R_4. \text{ The null point condition is given by:}\)

• A. \(\quad \frac{R_1}{R_2} = \frac{R_3}{R_4} \\\)
• B. \(\quad R_1 + R_2 = R_3 + R_4 \\\)
• C. \(\quad R_1 - R_2 = R_2 - R_4 \\\)
• D. \(\quad R_1 \times R_2 = R_3 \times R_4\)

Answer 1

The Correct Option is A

The Wheatstone bridge is balanced when the ratio of the two resistances in one branch equals the ratio of the two resistances in the other branch:
\(\quad \frac{R_1}{R_2} = \frac{R_3}{R_4} \\\)This is the condition for zero current through the galvanometer.