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Thermo e.m.f. E volt of certain thermo-c...

Thermo e.m.f. E volt of certain thermo-couple varies with temperature `theta` of a hot junction as `E = 40 theta - theta^2/20`. The neutral temperature of the thermo-couple is

A

`100^@ C`

B

`200^@C`

C

`400^@C`

D

`800^@C`.

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