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Current Electricity question

2003 · Shift 0 · Q127
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Current Electricity question

2003 · Shift 0 · Q127

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
The thermo e.m.f.e.m.f.e.m.f. of a thermo -couple is 25μV/∘C25\mu V/{}^ \circ C25μV/∘C at room temperature. A galvanometer of 40ohm40ohm40ohm resistance, capable of detecting current as low as 10−5 A,{10^{ - 5}}\,A,10−5A, is connected with the thermo couple. The smallest temperature difference that can be detected by this system is
  1. A
    160C{16^0}C160C
  2. B
    120C{12^0}C120C
  3. C
    80C{8^0}C80C
  4. D
    200C{20^0}C200C
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