The thermo … of a thermo -couple is … … at room temperature. A galvanometer of … … resistance, capable of detecting current as low as … is connected with the thermo couple. The smallest temperature difference that can be detected by this system is

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JEE Main 2003 · Annual, Paper 1 · Q6447

PhysicsMedium226×since 2002Q6447

The thermo

e.m.f.

of a thermo -couple is

25

\mu V/{}^ \circ C

at room temperature. A galvanometer of

40

ohm

resistance, capable of detecting current as low as

{10^{ - 5}}\,A,

is connected with the thermo couple. The smallest temperature difference that can be detected by this system is