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The emf of a thermocouple, cold junction...

The emf of a thermocouple, cold junction of which is kept at `- 300^@C` is given by `E= 40 t + 1/10 t^2`. The temperature of inversion of thermocouple will be ......

A

`200^@C`

B

`400^@C`

C

`-200^@C`

D

`-100^@C`

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