Linked PYQ
A Schering bridge, used to test a specimen, has thc following bridge arms: arm ab contains the unknown capacitance (C1) whose loss part is represented by a Series redistrict (P1), arm bc contains a 150 pF resistance (R), arm cd contains a variable capacitor (C) in parallel with a variable non-inductive resistance (R3) and arm da contains a standard capacitor (C) of 150 pF. The supply is connected between a and c and the detector is connected between b and d. The specimen is tested at a frequency of 50 Hz, it is having a thickness of 6-3 mm and it is tested between electrodes each having a dimension of 0.15 x 0.18 m. At balance, C4 = 0.375 uF and R4 = 423 ohm. Find the capacitance, dissipation factor and relative permittivity of the speciman. Given : Permittivily of free Space = 8.854 x 10-12 F/m.