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If  represent the increase in internal energy and work done by the system respectively in a thermodynamical process,which of the following is true?

(a) $∆U=-∆W,$ in a adiabatic process

(b) $∆U=∆W,$ in a isothermal process

(c) $∆U=∆W,$ in adiabatic process

(d) $∆U=-∆W,$in a isothermal process

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