A Maxwell bridge, designed to measure the unknown impedance (Ru, Lu) of a coil, isshown in Figure 7.8.(a) Derive an expression for Ru and Lu under balance conditions.(b) If the fixed bridge component values are R3 = 100 ohm and C =20 mF, calculatethe value of the unknown impedance if R1 = 3183 ohm and R2 = 50 ohm at balance.(c) Calculate the Q factor for the coil if the supply frequency is 50 Hz. 7.21 A Maxwell bridge, designed to measure the unknown impedance (Ru, Lu) of a coil, isshown in Figure 7.8.(a) Derive an expression for R, and L, under balance conditions.(b) If the fixed bridge component values are R3 = 100 Q and C = 20 µF, calculatethe value of the unknown impedance if R1 = 3183 N and R2 = 50 N at balance.(c) Calculate the Q factor for the coil if the supply frequency is 50 Hz. Maxwell bridgeA Maxwell bridge is shown in Figure 7.8. The requirement for a variable inductance boxis avoided by introducing instead a second variable resistance. The circuit requires onestandard fixed-value capacitor, two variable resistance boxes, and one standard fixed-valueresistor, all of which are components that are readily available and inexpensive. Referringto Figure 7.8, we have at the null-output point:įZAD = ,ZAB ; įZpc = ½ZBCR3'BR2Figure 7.8Maxwell bridge.elle

Wheatstone Bridge- It is a circuit constructed to find the unknown resistance with the help of the…

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Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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A Maxwell bridge, designed to measure the unknown impedance (Ru, Lu) of a coil, is
shown in Figure 7.8.
(a) Derive an expression for Ru and Lu under balance conditions.
(b) If the fixed bridge component values are R3 = 100 ohm and C =20 mF, calculate
the value of the unknown impedance if R1 = 3183 ohm and R2 = 50 ohm at balance.
(c) Calculate the Q factor for the coil if the supply frequency is 50 Hz.

7.21 A Maxwell bridge, designed to measure the unknown impedance (Ru, Lu) of a coil, is
shown in Figure 7.8.
(a) Derive an expression for R, and L, under balance conditions.
(b) If the fixed bridge component values are R3 = 100 Q and C = 20 µF, calculate
the value of the unknown impedance if R1 = 3183 N and R2 = 50 N at balance.
(c) Calculate the Q factor for the coil if the supply frequency is 50 Hz.

Maxwell bridge
A Maxwell bridge is shown in Figure 7.8. The requirement for a variable inductance box
is avoided by introducing instead a second variable resistance. The circuit requires one
standard fixed-value capacitor, two variable resistance boxes, and one standard fixed-value
resistor, all of which are components that are readily available and inexpensive. Referring
to Figure 7.8, we have at the null-output point:
įZAD = ,ZAB ; įZpc = ½ZBC
R3
'B
R2
Figure 7.8
Maxwell bridge.
elle

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