A Wheatstone bridge is balanced when:
✓ Correct Answer: Option B
Balanced Wheatstone bridge: R₁R₄ = R₂R₃ (or R₁/R₂ = R₃/R₄). No current through the galvanometer.
Balanced Wheatstone bridge: R₁R₄ = R₂R₃ (or R₁/R₂ = R₃/R₄). No current through the galvanometer.