Measurement of Capacitance by Carey Foster Bridge 
A modified Carey Foster's bridge shown in the figure is used for measurement of capacitance. Arm ab contains the secondary winding a mutual inductance of 18.35 mH and a total non reactive resistance of 200 Ω. The inductance of secondary of mutual inductor in arm ab is 40.6 mH .Arm ad is short circuited. Arm bc contains the unknown capacitor in series with a resistance of 119.5 Ω. Arm cd comprises of a resistor of 100 Ω resistance. Determine the capacitance and its equivalent series resistance.
At balance R4=10Ω, R3=25.1`+-0.1` Ω, R1=100Ω, L1=22.82 mH and M=4920`+-10` uH. Find the unknown capacitance C3 and the limits of accuracy determined by the limits of balance measurements indicated.
Suppose in the above example the value of R3 does not include the series loss resistance of capacitor, find the loss resistance and limits of its accuracy
If a capacitor is connected across a portion of resistance of multiplier of the wattmeter then the pressure coil of the circuit becomes
Shielding of the capacitor is done to