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Q.

The voltage E of a thermocouple as a function of temperature is given by E=6.2 T+0.0002 T3. When T changes from 100° to 101° the approximate change in E.

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a

12.12

b

12.1

c

12

d

12.2

answer is D.

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Detailed Solution

T=100   αT=1δE=6.2 δT+0.002×3T2 δT      =6.2+6=12.2

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