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| Numerical 09 |
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| 09. At room temperature, the thermo emf of a copper constant couple is 40 mV per degree. What is the smallest temperature difference that can be detected with a single such couple and a galvanometer of 100 ohm resistance capable of detecting current as low as 10-6 ampere? |
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| Suggested solution: |
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| Let qoC be the smallest temperature that can be measured. |
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| Corresponding thermo emf = 40 x q m V = 40 x q x 10-6V |
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| Resistance of the galvanometer = 100W |
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| Smallest current that can be detected, I=10-6A |
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