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How is the bridge balanced?

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How is the bridge balanced?

(a) using resistance R1

(b) using resistance R3

(c) through capacitance C3

(d) through capacitance Cx

I had been asked this question in a national level competition.

Asked question is from Capacitance Comparison Bridge in division Measurement of Inductance and Capacitance of Electrical Measurements

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Correct choice is (b) using resistance R3

For explanation I would say: Bridge balance is obtained by varying the resistance R3. At balance we get the value of the unknown resistance as Rx = ^R1 R3⁄R2.

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