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Q.

A refrigerator, whose coefficient of performance β is 4, extracts heat from the cooling compartment at the
rate of 400 J per cycle. How much work per cycle is required to operate the refrigerator?  

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a

100 J

b

200 J

c

50 J

d

25 J

answer is A.

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Detailed Solution

β=Q2W ⇒4=400W

⇒ W=100J

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