Question

In figure, if the potential at point $P$ is $100\text{V}$, what is the potential at point $Q$?

• A. $10\text{V}$
• B. $20\text{V}$
• C. $-20\text{V}$
• D. $-10\text{V}$

Answer 1

The correct option is D $-10\text{V}$

$i=\frac{150-50}{3+2}=20\text{A}$
$V_P-V_Q=50+3.0i$
$\Rightarrow V_Q=100-(50+60)$
$\therefore V_Q=-10\text{V}$