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A rogular Wheatstone bridge is used to measure high resistances (in the megohm range). The bridge has ratio arms of 10,000 N and 10 Q. The adjustable arm has a maximum value of 10,000 2. A battery of 10 V enf and negligiblę resistance is connected from the junction of ratio arms to the opposite corner ? (a) What is the maximum resistance that cao be measured by this arrangement? (b) If the galvanometer has a sensitivity of 200 mm/µA and a resistance of 50 2, how much unbalance is needed to give a galvanometer deflection of 1 mm for the maximum resistance of part (a) ? (c) If the galvanometer of part (b) is replaced by a galvanometer of sensitivity of 1000 mm/pA and a resistance of 1000 2, calculate the change in resistance to cause a deflection of 1 mm.

A rogular Wheatstone bridge is used to measure high resistances (in the megohm range). The bridge has ratio arms of 10,000 N and 10 Q. The adjustable arm has a maximum value of 10,000 2. A battery of 10 V enf and negligiblę resistance is connected from the junction of ratio arms to the opposite corner ? (a) What is the maximum resistance that cao be measured by this arrangement? (b) If the galvanometer has a sensitivity of 200 mm/µA and a resistance of 50 2, how much unbalance is needed to give a galvanometer deflection of 1 mm for the maximum resistance of part (a) ? (c) If the galvanometer of part (b) is replaced by a galvanometer of sensitivity of 1000 mm/pA and a resistance of 1000 2, calculate the change in resistance to cause a deflection of 1 mm.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A rogular Wheatstone bridge is used to measure high resistances (in the megohm range). The bridge has ratio arms of 10,000 N and 10 n. The adjustable arm has a maximum value of 10,000 2. A battery of 10 V enf and negligiblę resistance is connected from the junction of ratio arnis to the opposite corner ? (a) What is the maximum resistance that cao be measured by this arrangement? (b) If the galvanometer has a sensitivity of 200 mm/µA and a resistance of 50 2, how much unbalance is needed to give a galvanometer deflection of 1 mm for the maximum resistance of part (a) ? (c) If the galvanometer of part (b) is replaced by a galvanometer of sensitivity of 1000 mm/uA and a resistance of 1000 2, calculate the change in resistance to cause a deflection of 1 mm.
Transcribed Image Text:A rogular Wheatstone bridge is used to measure high resistances (in the megohm range). The bridge has ratio arms of 10,000 N and 10 n. The adjustable arm has a maximum value of 10,000 2. A battery of 10 V enf and negligiblę resistance is connected from the junction of ratio arnis to the opposite corner ? (a) What is the maximum resistance that cao be measured by this arrangement? (b) If the galvanometer has a sensitivity of 200 mm/µA and a resistance of 50 2, how much unbalance is needed to give a galvanometer deflection of 1 mm for the maximum resistance of part (a) ? (c) If the galvanometer of part (b) is replaced by a galvanometer of sensitivity of 1000 mm/uA and a resistance of 1000 2, calculate the change in resistance to cause a deflection of 1 mm.
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