Four capacitors and two batteries are connected as shown in the diagram. The `p.d` between the points `a` and `b` is
.

Options

A. 22 V
B. 15 V
C. 13 V
D. 0 V

Answer

C

Explanation

P.D across `2mu F` capacitor is
`(22-7) xx (3)/((3+2))=9V`
p.d across `8 muF` capacitor is `= 22V`
As the positively charged plates of `2 muF` and `8 muF` are connected `V_(a)-V_(b) = 22-9 = 13 V`.