
2)

Step-by-step explanation
the electrostatic force between two forces is given by:

then, complete the table we need to use this equation
where

k, q1 and q2 are ginven in the table, so
Step 1
Let

so,replace

hence, for tha row

Step 2
now, do the same for the next Fe, so
b)Let

so,replace

hence, for tha row

Step 3
now, do the same for the next Fe, so
c)Let

so,replace

hence, for that row

Step 4
now, do the same for the next Fe, so
c)Let

so,replace

hence, for tha row

Step 5
now, do the same for the next Fe, so
c)Let

so,replace

hence, for that row

Step 6
find the electrostastic force betweeen electrons
let

as the distance is not give, let's use
distance =1
replace in the formula

therefore, the electrostaic force is

I hope this helps you