The Resistance of a Platinum Wire Is to Be Calibrated

question 11

Multiple Choice

The resistance of a platinum wire is to be calibrated for low-temperature work.A platinum wire with resistance 1.5 Ω at 30°C is immersed in liquid nitrogen at 93 K (−180°C) .If the temperature response of the platinum wire is linear,what is the expected resistance of the platinum wire at −180°C? [α_platinum = 3.92 × 10−³ (°C) −¹].

• A)0.265 Ω
• B)2.38 Ω
• C)2.73 Ω
• D)8.48 Ω
• E)0.618 Ω

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