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The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by

A. T1/(T1-T2)

B. T2/(T1-T2)

C. T1/T2

D. T2/R1

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