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At high frequencies in an AC bridge, the source is _______

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At high frequencies in an AC bridge, the source is _______

(a) tuned amplifiers

(b) oscillators

(c) vibration galvanometer

(d) high voltage source

The question was asked by my college professor while I was bunking the class.

This intriguing question originated from Sources and Detectors topic in chapter Measurement of Inductance and Capacitance of Electrical Measurements

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The correct answer is (b) oscillators

Easy explanation: Tuned amplifiers are used as a source of voltage in AC bridges. Electronic oscillators are used as a source of supply for bridge measurements in an AC bridge circuit at high frequencies.

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