Question

The potential at point P in an electric field is 300 V. (Let's denote the electric potential energy as UE.)

(a) What is the electrical potential energy of a proton placed at P, in eV and in joules?

Ue=

Ue=

(b) What is the electrical potential energy of an electron at P, in eV and in joules?

Ue=

Ue=

Answer 1

Here we have given that,

potential at point P = 300 V

And we know the formula of ,

electric potential energy UE at a point is = V× q

Here V is the potential of that point and q is the charge

Now,

A. Here we have to consider the proton

Charge on proton q =1.602176634×10^ −19 C

So that Ue = 1.602176634×10^ −19 × 300 = 300.022 eV

And in joule Ue = 4.8 × 10-17 J

B. Now we have to consider the electron whose charge is,

q = - 1.602176634×10−19 C

So that its potential energy Ue = V× q = - 300.022 eV

And in joule Ue = - 4.8 ×10 -17J