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At very low frequencies in a AC bridge, the source is _________

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At very low frequencies in a AC bridge, the source is _________

(a) power line

(b) e.m.f

(c) galvanometer

(d) tuned circuit

I had been asked this question in a job interview.

I'm obligated to ask this question of Sources and Detectors in chapter Measurement of Inductance and Capacitance of Electrical Measurements

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Correct answer is (a) power line

To explain: Galvanometer is used for detecting the balance condition. The power line acts as a source of supply for bridge measurements in an AC bridge circuit at very low frequencies.

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