1548. Harmonic mean temperature difference is given by

√(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ – ΔT₂)
(ΔT₁ – ΔT₂)/(ΔT₁ . ΔT₂)
✅ The correct answer is option B.

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