Question

Thirteen resistances each of resistance R ohm are connected in the circuit as shown in the figure. The effective resistance between A and B is -

• A. 2RΩ
• B. $\frac{4R}{3}$Ω
• C. $\frac{2R}{3}$Ω
• D. RΩ

Answer 1

Answer: (C)

$\frac{2R}{3}$Ω

Answer 2

From symmetry

For half circuit

R' = $\frac{R}{3}$, R_eq = $\frac{2R}{3}$