Teaching TN TRB EE Test Series Electrical and Electronics Measurements Measurement of R/L/C Using Bridge Circuits
A condenser brushing forms arm AB of a Schering bridge and a standard capacitor of 500 pF and negligible loss forms arm AD. Arm BC consists of a non-inductive resistance of 300 ohms, When the bridge is balanced, arm CD has a resistance of 72.6 ohms in parallel with a capacitance of 0.148 μF. The supply frequency is 50 Hz. Calculate the unknown capacitance.
1
0.121 nF
2
0.421 μF
3
0.321 μF
4
0.221 μF