Question

The equations under balanced conditions for a bridge are:

$R_1=\frac{R_2{R}_3}{R_4}and{L}_1=R_2{R}_3{C}_{4}where{R}_{1}and{L}_1$ are respectively unknown resistance and inductance. In order to achieve faster balance which of the following variables are chosen?

• A. $R_{2}and{R}_3$
• B. $R_{2}and{C}_4$
• C. $R_{4}and{C}_4$
• D. $R_{3}and{C}_4$

Answer 1

The correct option is C $R_{4}and{C}_4$

By choosing $R_{4}and{C}_4$ as the variables, both the equation i.e. for $R_{1}and{L}_1$ can be made independent and hence independent balance for $R_{1}and{L}_1$ can be obtained.