Find the mean temperature rise of a coil when its resistance is 21 Ω – McqOptions

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1.	Find the mean temperature rise of a coil when its resistance is 21 Ω and the surrounding temperature is 15°C. It has a resistance of 18 Ω when its mean temperature is 20°C and of 20 Ω when mean temperature is 50°C.
A.	50°C
B.	40°C
C.	30°C
D.	20°C
Answer» B. 40°C

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