A potentiometer wire of 5m length and ha...

A potentiometer wire of 5m length and having 20`Omega `resistance is connected in series with a battery and a resistance of `3980 Omega `. A cell of emf 1.1V is balanced across the potential difference of the external resistance. If the emf of the thermocouple is 2.2mV, the corresponding balancing length is

`2 mV`

`4 mV`

`3 mV`

`1 mV`

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