Question

In the circuit shown in the figure, reading of voltmeter is V₁ when S₁ is closed, reading of voltmeter is V₂ when only S₂ is closed and reading of voltmeter is V₃ when both S₁ and S₂ are closed. Then -

• A. V₃> V₂> V₁
• B. V₂> V₁> V₃
• C. V₃> V₁> V₂
• D. V₁> V₂> V₃

Answer 1

Answer: (B)

V₂> V₁> V₃

Answer 2

When S₁ closed

V₁ = $\frac{3R}{R + 3R}$E = $\frac{3}{4}$E

When S₂ is closed

V₂ = $\frac{6R}{R + 6R}$E = $\frac{6}{7}$E

When both is closed

V₃ = $\frac{2R}{R + 2R}$E = $\frac{2E}{3}$

∴ V₂ > V₁ > V₃