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1st Law of Thermodynamics

A system is g...

Question

A system is given 400 J of heat and 1000 Joule of work is done by the system, then the change in internal energy of the system will be

A

-600 Joule

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B

680 erg

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C

860 Joule

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D

- 860 Joule

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Solution

The correct option is A -600 Joule
Heat, $d q = 400 c a l o r i e = + 400 J$

Work done by the system, $d w = 1000 J$

Change in internal energy,

$d u = d q - d w$

$= 400 - 1000$

$= - 600 J$

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