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Which is the guarding arm?

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in Electrical Measurements by (148k points)
Which is the guarding arm?

(a) parallel RC combination

(b) series RC combination

(c) resistance R

(d) capacitance C

I have been asked this question in an interview for job.

My question is from Shielding and Grounding of Bridges in section Measurement of Inductance and Capacitance of Electrical Measurements

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Correct answer is (b) series RC combination

The best I can explain: The series combination of R and C in a Wagner earth device forms a potential divider across the ratio arms. It is also known as the guard arm.

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