Question

why and how do the electrons flow in a wire when a potential difference is applied across it​

Answer 1

Explanation:

potential difference.

Negatively- charged electrons are removed from atoms, the atoms being left as positive ions. ... If a wire is used to connect the two terminals, electrons from the negative terminal and free electrons in the wire are attracted to the positive terminal and will flow through the wire.

Answer 2

Electrons will flow against the electric field lines because their charge is negative, and the electric field thus exerts a force F = q E on them which is in the opposite direction. Thus electric field lines inside the wire