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प्रश्न
A system absorbs 6 kJ of heat and does 1.5 kJ of work on its surroundings. The change in internal energy is __________.
विकल्प
– 7.5 kJ
– 4.5 kJ
+4.5 kJ
+ 7.5 kJ
उत्तर
+4.5 kJ
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