Question

When steady state is reached, find the potential difference between the points A and B and between the points B and C respectively.

• A. $75\text{V}$ and $25\text{V}$
• B. $35\text{V}$ and $65\text{V}$
• C. $25\text{V}$ and $75\text{V}$
• D. $65\text{V}$ and $35\text{V}$

Answer 1

The correct option is C $25\text{V}$ and $75\text{V}$

Given circuit can be rearranged as below,

At steady state $i=0$, so potential at $A$ is $100\text{V}$
By dividing potential across $6\mu F\text{and}2\mu F,$
$V_A-V_B=V_{6\mu F}=\frac{2}{(6+2)}\times 100$
$V_A-V_B=V_{6\mu F}=25\text{V}$
Now, $V_B-V_C=V_{2\mu F}=100-25=75\text{V}$