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Bridge is balanced by ________

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Bridge is balanced by ________

(a) galvanometer

(b) oscillator

(c) zero adjustment resistor

(d) head phone

I got this question by my college professor while I was bunking the class.

This interesting question is from Basic Electronic Voltmeter in section Electronic Instruments of Electrical Measurements

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The correct option is (c) zero adjustment resistor

Easiest explanation: Bridge circuit in a basic D.C. electronic voltmeter is balanced by making use of a zero adjustment resistor such that the pointer shows zero deflection.

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