Question

At time $t=0$, the capacitor is uncharged and the switch is closed.
What is the total current in the circuit just after the switch is closed?

• A. $0.66A$
• B. $1.0A$
• C. $3.0A$
• D. $5.0A$

Answer 1

Answer: (A)

$0.66A$

Here the capacitor will act as a closed circuit just after the switch is closed. So the both $20\Omega$ resistors will connect in parallel. Thus the equivalent resistance of the circuit is $R_{eq}=5+\frac{20\times 20}{20+20}=15\Omega$

Thus, total current in the circuit is $I=10/15=0.66A$ (By Ohm's law)