Q. Assertion : Electrons move from a region of higher potential to a region of lower potential.
Reason : An electron has less potential energy at a point where potential is higher and vice-versa.

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Solution:

Since electron has a negative charge, so it has less potential energy at a point where the potential is higher and vice-versa
Hence in an electric field an electron moves from a region of lower potential to a region of higher potential.
(i.e., it tends to move in such a way so that its potential energy become minimum,