A sample of an ideal gas undergoes an isothermal expansion. If \( d Q, d U \) and \( d W \) repr...

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A sample of an ideal gas undergoes an isothermal expansion. If \( d Q, d U \) and \( d W \) represent the amount
P of heat supplied, the change in intemal energy and

WV the work done respectively, then
(1) \( d Q=+v e, d U=+v e, d W=+v e \)
(2) \( d Q=+v e, d U=0, d W=+v e \)
(3) \( d Q=+v e, d U=+v e, d W=0 \)
(4) \( d Q=-v e, d U=-v e, d W=-v e \)
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