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.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter7: Parallel Circuits

Section: Chapter Questions

Problem 3PP: Using the rules for parallel circuits and Ohmslaw, solve for the missing values....

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