A Wheatstone bridge is balanced when the resistances are 2 Ω, 3 Ω, 4 Ω, and 6 Ω. The unknown resistance is:
Correct answer: C. 6 Ω
- A. 2 Ω
- B. 4 Ω
- C. 6 Ω
- D. 8 Ω
Explanation
For a balanced Wheatstone bridge, R₁/R₂ = R₃/R₄. Let the unknown resistance be Rₓ. Using the given values, 2/3 = 4/Rₓ. Solving, Rₓ = 4 × 3/2 = 6 Ω.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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