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The mathemeatical form of the first law ...

The mathemeatical form of the first law of thermodynamics when q is the heat supplied and w the work done by the system is

A

`DeltaU=q+w`

B

`DeltaU=q-w`

C

`DeltaU=w-q`

D

`DeltaU=-q-w`

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The correct Answer is:
B
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