Identify the force present and explain whether work is done when a positively charged particle moves in a circle at a fixed distance from a negatively charged particle, an iron nail is pulled off a magnet.

electric force of attraction, The work is zero

Explanation:

Between a positive and a negative charge there is an electric force of attraction, as in this case the particle moves in an orbit circulates at a certain velocity at an angle between the displacement and the force is 90, consequently the work defined by

W = F d cos θ

The work is zero, therefore the elective force does not create work on the load.