Question

A tetrahedral is consisting of $6$ identical wires as shown in the figure. Each wire is having a resistance of $4\Omega$. When an ideal cell of emf $5V$ is connected across $AB$ as shown, then current through $OR$ is

• A. $4A$
• B. $\frac{6}{19}A$
• C. Zero
• D. $1A$

Answer 1

Answer: (C)

Zero

From the symmetry of the figure, it is clear that $O$ and $R$ are at same potential so no current flows from $OR$ branch.
Thus, $I_{OR}=0\left(zero\right)$.