In the first law of thermodynamics, ΔE=Q−W , what does Q stand for? the heat added to the system

the internal energy of the system

the change in the internal energy of the system

the work done by the piston

Imagine that the rightward current flows in the rod for a short time. as a result, what will the net charge on the right and left ends of the rod become? left end negative and right end positive left end negative and right end negative left end negative and right end nearly neutral left end nearly neutral and right end positive both ends nearly neutral