The resistance of a coil used in a plati...

The resistance of a coil used in a platinum-resistance thermometer at `0^(@)C` is `3.00 Omega` and at `100^(@)C` is `3.75 Omega`. Its resistance at an unkown temperature is measured as `3.15 Omega`. Calculate the unknown temperature.

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The correct Answer is:

`20^(@)C`

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