A Maxwell bridge, designed to measure the unknown impedance ðRu; LuÞ of a coil, is shown in Fig. 6.8. (a) Explain briefly what the merits of a Maxwell bridge are compared with other forms of...

A Maxwell bridge, designed to measure the unknown impedance ðRu; LuÞ of a coil, is

shown in Fig. 6.8.

(a) Explain briefly what the merits of a Maxwell bridge are compared with other

forms of null-type, AC bridges.

(b) Derive an expression for Ru and Lu under balanced conditions.

(c) If the fixed bridge component values are R3 ¼ 270 U and C ¼ 50 mF, calculate

the value of the unknown impedance if R1 ¼ 963.9 U and R2 ¼ 75.4 U at

balance.

(d) Calculate the Q factor for the coil if the supply frequency is 60 Hz.