A 3 core cable can be represented as shown in figure .Find the values of Rs ,Cs ,Rm and Cm given that: When two of the cable cores are connected together and then short circuited to the cable sheath, the third core and sheath are connected to the terminals of the Shering bridge, balance occurs at R3=4000 ohm. When the three cores are short circuited together and the cable is connected between the cores and the sheath to the Schering bridge, balanace occurs at R3=2000 ohm. The other bridge parameters are CN= 104F ,C4=0.02 F, R4=4000 ohm. If 6 kV is applied to the cable , find the charging current at 50 c/s