Question

Unknown resistance is obtained by using which of the following relation?

(a) Rx = \(\frac{R_1 R_3}{R_2}\)

(b) Rx = \(\frac{R_2 R_3}{R_1}\)

(c) Rx = \(\frac{R_2 R_1}{R_3}\)

(d) Rx = \(\frac{R_2}{R_1}\)

I have been asked this question in an international level competition.

Question is from Capacitance Comparison Bridge topic in chapter Measurement of Inductance and Capacitance of Electrical Measurements

Answer 1

Correct answer is (b) Rx = \(\frac{R_2 R_3}{R_1}\)

The explanation: The value of the unknown resistance is obtained by using the relation

 Rx = \(\frac{R_2 R_3}{R_1}\)

at balance condition.