consider two point charges of 1.60uC and -22.25uC. Determine the magnitude of the force between the two charges when placed 6.50cm apart.

Explanation:

From the question we are told that

Point charges

Displacement

Generally the equation for Coulomb's law is Mathematically given as

Therefore

with  -(negative) showing form of force Magnitude =>

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.