A platinum resistance thermometer has a resistance 4Ω at 0°C and 100Ω at 100°C. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C

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A. 14.0Ω
B. 6.7Ω
C. 3.2Ω
D. 2.7Ω

Correct Answer: Option B

B. 6.7Ω

Explanation

(R−4)/(10−4) = (45−0)/(100−0)

R = 670/100=6.7Ω

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