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NEET2011PhysicsCurrent ElectricityActual

A thermocouple of negligible resistance produces an emf of 40 V / ^ C in the linear range of temperature. A galvanometer of resistance 10 whose sensitivity is 1 A / div, is employed with the termocouple. The smallest value of temperature difference that can be detected by the system will be

Options

  1. A0.5^ C
  2. B1^ C
  3. C0.1^ C
  4. D0.25^ C

Correct answer

D. 0.25^ C

Step-by-step solution

For minimum deflection of 1 division require current =1 A voltage required =i R=1 10=10 V aligned 40 V & 1^ C 10 V & 1 4 ^ C & =0.25^ C aligned

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