The Resistance of a Platinum Wire Is to Be Calibrated $\degree$

question 39

Multiple Choice

The resistance of a platinum wire is to be calibrated for low-temperature work.A platinum wire with resistance 1.000 W at 20 $\degree$ C is immersed in liquid nitrogen at 77 K (-196 $\degree$ C) .If the temperature response of the platinum wire is linear,what is the expected resistance of the platinum wire at -196 $\degree$ C? [a_platinum = 3.92x 10^-3 ( $\degree$ C) ^-1].

• A)0.153 W
• B)0.232 W
• C)1.768 W
• D)1.847 W

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The difference in total cost that will result from selecting one alternative over another.

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