Question

Two capacitors each of capacitance 2 M F are connected in series between the points A and B.Another parallel combination of two
capacitors each of capacitance C is connected between A and B. If the effective capacitance
between A and B is 9 MF, then C has a value of

a) 1 MF
b) 2 MF
c) 3 MF
d) 4 MF​

Answer 1

Explanation:

When two capacitors of capacitance 2μF are in parallel , the equivalent capacitance is

C

eq

=2+2=4μF. Now it is connected to 12μF in series . So the capacitance of system is C

sys

=

4+12

4×12

=3μF