The thermo emf E (in volts) of a certain...

The thermo emf E (in volts) of a certain thermocouple is found to vary with Q (in C) acoording to eqution `(E=20Q-Q^2/(20))`, where Q is tempereature of the hot function, the cold function being kept at `0^@C`. Then the neutral temperature of the thermocouple is

`300^@C`

`400^@C`

`100^@C`

`200^@C`

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