The temperature gradient in a rod of 0.5...

The temperature gradient in a rod of `0.5 m` length is `80^(@)C//m`. It the temperature of hotter end of the rod is `30^(@)C`, then the temperature of the cooler end is

`40^(@)C`

`-10^(@)C`

`10^(@)C`

`0^(@)C`

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