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What is applied to the two opposite junctions of a bridge circuit?

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What is applied to the two opposite junctions of a bridge circuit?

(a) source of voltage

(b) source of current

(c) source of power

(d) source of impedance

The question was asked by my school principal while I was bunking the class.

Asked question is from Introduction of Bridges topic in chapter Measurement of Resistance of Electrical Measurements

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The correct option is (b) source of current

Explanation: A current source is connected between the two opposite junctions of a bridge circuit. Deflection of the galvanometer in the circuit indicates the flow of current.

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