Given, electric field,
(a) Mass of the particle,
The force on the particle is
The magnitude is
(b) Here, the potential at (12,0) is
And the potential at (0, 5) is
(c) The potential energy at (12,5) m is
And potential energy at the origin is zero.
therefore, the change in potential energy is
(d) From (b) we know that the potential at (12,0) is equal to the potential at (0,5). This makes an equipotential surface and hence the potential energy of the particle would be same at both the points. So, the change in potential energy is zero.
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