Under balanced condition of a bridge for measuring unknown impedance,...
The zero response of the detector indicates balance. At balance, no current flows through the detector, i.e., there is no potential difference across the detector, or in other words, the potentials at points B and C are the same.
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Under balanced condition of a bridge for measuring unknown impedance,...
Explanation:
Under balanced condition, the impedance of the unknown component is measured accurately. If the detector is suddenly taken out, the balanced condition will be disturbed. However, the measured value of the impedance will not change because the bridge circuit is still intact, and the balance condition will still be maintained.
Reasoning:
The bridge circuit is designed in such a way that it produces a null voltage across the detector when the unknown impedance is balanced with the known impedance. This null voltage is measured to determine the value of the unknown impedance. So, the measurement of the unknown impedance does not depend on the presence or absence of the detector as long as the circuit is intact and balanced.
Conclusion:
In conclusion, the measured value of the impedance will not change when the detector is suddenly taken out because the bridge circuit is still intact and balanced. Therefore, option 'C' is the correct answer.