Question

Please solve this question. (qno. 4th)

Answer 1

Va-Vb=100 V

let

Va=100 V

then Vb=0 V

the 6 F and 4 F capacitors are in parallel

therefore net capacitance for the pair=C=6+4=10 F

Method 1

since C and the 10 F resistors have same value therefore the voltage distribution should be equal ie 100/2=50 V

Method 2

net capacitance of the system=

1/Cf=1/C+1/10

=1/10+1/10

=1/5

Cf=5 F

net charge for the circuit Q=

=CV

=5*100

=500 C

therefore

Va-Vc=Q/C

100-Vc=500/10

100-Vc=50

Vc=50 V

Hope this helps