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For a thermocouple, the neutral temperat...

For a thermocouple, the neutral temperature is `270^(@)C` and the temperature of its cold junction is `20^(@)C` . If there is no deflection in the galvanometer, the temperature of the hot junction should be

A

`210^(@)C`

B

`540^(@)C`

C

`520^(@)C`

D

`209^(@)C`

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