Question

25. In a region of space, suppose there exists a
uniform electric field E = 10i (Vm). If a positive
charge moves with a velocity v
potential energy at this moment
(1) Increases
(2) Decreases
(3) Does not change
(4) Both (1) and (2)
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Answer 1

Answer:

Explanation:

Here, in the question it is given that the electric field is uniform and as the electric field is depended on the potential energy and this electric field is not changing hence one of the factor responsible for the change in the potential energy is now out.

Now, comes the second factor which is the positive charge and its velocity "v" but as we know from the formulae that the potential energy is only depended on dipole, charge and electric filed and does not depends on the velocity of the charge hence the potential energy at that moment or anywhere with constant electric field will remain unchanged .

Answer 2

Answer:

It does not change

Explanation:

∆U= - workdone = F.dr = qE .dr

Here , E (electric field) is constant , therefore potential energy remains same.

Hope it is useful.