The point charges `q_(A)=3 muC` and `q_(B)=-3 muC` are located 20 cm apart in vaccum.
If a negative test charge of magnitude `1.5xx10^(-9) C` is placed at this point 'o', what is the force experienced by the test charge?

Explanation

Let test charge `q_(0)=-1.5 xx10^(-9) C` is placed at midpoint 'O'.
Electric field intensity at 'O' is `E=5.4xx10^(6)`
Force `F=E_(q)=5.4xx10^(6)xx-1.5xx10^(-9) N`
`=-8.1xx10^(-3)N`
The direction of force is from O to A.