The Resistance of a Platinum Wire Is to Be Calibrated

question 55

Multiple Choice

The resistance of a platinum wire is to be calibrated for low-temperature work.A platinum wire with resistance 3 Ω at 27°C is immersed in liquid nitrogen at 75 K (−198°C) .If the temperature response of the platinum wire is linear,what is the expected resistance of the platinum wire at −198°C? [α_platinum = 3.92 × 10−³ (°C) −¹].

• A) 0.354 Ω
• B) 5.011 Ω
• C) 5.646 Ω
• D) 25.424 Ω
• E) ​0.989 Ω

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