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.

ill do it for 100, also this isnt 80 its 40

c) up is the direction the magnetic force is acting on the charge.