Question

In the circuit shown, each resistance is 2Ω. The potential V₁ as indicated in the circuit is equal to –

• A. 11V
• B. – 11V
• C. 9V
• D. –9V

Answer 1

Answer: (D)

–9V

Answer 2

i = $\frac{7V}{7\Omega}$ = 1A

V₁ = – 9V

$\int_{r = b}^{r = a}\frac{dr}{r^{2}}$

$\frac{v_{1} - v_{2}}{i}$ = $\frac { \rho } { 4 \pi }$ $\left( \frac{a - b}{ab} \right)$

∴ R = $\frac{\rho}{4\pi}\frac{(a - b)}{ab}$