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The smallest temperature difference meas...

The smallest temperature difference measured with a thermocouple of e.m.f. `30 muVC^-1` and a galvanometer of `50 Omega` and capable of measuring a minimum current of `3 xx 10^-7 A` is

A

`0.5^@`

B

`1^@`

C

`1.5^@`

D

`2^@`.

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