COMEDK Exam 2013 Solved Paper

2Ω and 3Ω resistors are in parallel, so their equivalent resistance,
Req=

2×3

2+3

=

6

5

=1.2Ω
As capacitor blocks DC at steady state, so the resistor 4Ω is ineffective.
The Req and 28‌Omega are in series, so total resistance of circuit,
Rr=1.2+2.8=4Ω
Current in circuit, I=

V

Rr

=

6

4

=1.5A
Potential across the combination of 2Ω and 3Ω resistors V′=1.5×1.2=1.8V
∴ The study state current in 2Ω resistor is
I′=

V′

2

=

1.8

2

=0.9A