The potential at point $E$ for the given figure is ................ $\mathrm{V}$
Diffcult
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Let potential at point $\mathrm{E}$ be $\mathrm{V}$ and $\mathrm{A}, \mathrm{B}, \mathrm{C}$ are neutral point. (zero potential point)
Apply $\mathrm{KCL}$ at point $\mathrm{E}$
$\frac{\mathrm{V}-10}{1}+\frac{\mathrm{V}-30}{2}+\frac{\mathrm{V}+50}{2}=0$
$2(v-10)+V-30+V+50=0$
$4 \mathrm{V}=0 \quad \Rightarrow \quad \mathrm{V}=0$
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