14th Edition

ISBN: 9780133969290

Author: Hugh D. Young, Roger A. Freedman

Publisher: PEARSON

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Chapter 26, Problem 26.74P

The Wheatstone Bridge. The circuit shown in Fig. P26.74, called a Wheatstone bridge, is used to determine the value of an unknown resistor X by comparison with three resistors M, N, and P whose resistances can be varied. For each setting, the resistance of each resistor is precisely known. With switches S₁ and S₂ closed, these resistors are varied until the current in the galvanometer G is zero; the bridge is then said to be balanced. (a) Show that under this condition the unknown resistance is given by X = MP/N. (This method permits very high precision in comparing resistors.) (b) If galvanometer G shows zero deflection when M = 850.0 Ω, N = 15.00 Ω, and P = 33.48 Ω, what is the unknown resistance X?

Figure P26.74

Chapter 26, Problem 26.74P, The Wheatstone Bridge. The circuit shown in Fig. P26.74, called a Wheatstone bridge, is used to

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Chapter 26, Problem 26.73P

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Chapter 26 Solutions

University Physics (14th Edition)

Ch. 26 - In which 120-V light bulb does the filament have...Ch. 26 - Two 120-V light bulbs, one 25-W and one 200-W,...Ch. 26 - You connect a number of identical light bulbs to a...Ch. 26 - In the circuit shown in Fig. Q26.4, three...Ch. 26 - If two resistors R1 and R2 (R2 R1) are connected...Ch. 26 - If two resistors R1 and R2 (R2 R1) are connected...Ch. 26 - A battery with no internal resistance is connected...Ch. 26 - A resistor consists of three identical metal...Ch. 26 - A light bulb is connected in the circuit shown in...Ch. 26 - A real battery, having nonnegligible internal...

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