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The temperarture gradient in a rod of 0....

The temperarture gradient in a rod of 0.5 m long is `80^(@)Cm^(-1)`. If the temperature of hotter end of the rod is `30^(@)`C, then the temperature of the cooler ends is

A

`40"^(@)C`

B

`10"^(@)C`

C

`10"^(@)C`

D

`0"^(@)C`

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