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Q.

The thermo e.m.f. of a thermo-couple is 25PV/°C at room temperature. A galvanometer of 40Ω resistance, capable of detecting current as low as 10-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

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a

8°C

b

12°C

c

20°C

d

16°C

answer is B.

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Detailed Solution

The p.d. across galvanometer,

V=iR=10-5 x 40=40x10-5volt

The temperature difference that can be detected,

∆T=40x10-525x10-6=16°C

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