Question

) What is the net work done in moving the point charge of 10 nC from a point
on the axis at a distance 5 m above the plane to a point on the axis at a distance
5 m below the plane?

Answer 1

100nJ

Explanation:

The work done in this case can be calculated by the difference of potentials at the two points.

Assume the point charge to be in a uniform potential field of 1 V.

Then the total work done on the point charge can be calculated as

W = total distance * charge * potential

W = $(5+5)*10^-9*10$J

W = 100nJ

This gives our total work done on the charged particle as 100nJ or 10^-7 Joules.