Solution:-
Given –
Charge (q1) = -40 nC, its converted into coulomb (q1) = -40
*10-9 C
Force (F) = 12 N
Distance (r) = 0.050 m
Using electric force equation,
Formula-Â Â Â Â Â Â Â Â Â Â Â Â Â Â
F = k*q1q2 / r2
Where,
F = force
                                                                                   Â
q1 = first charge
q2 = second charge
r = distance between two charges
K – Coulomb constant and its value is 9*109 c
Calculate q2,
q2 = F*(r2) / k*q1
Putting given value in above equation, and calculate q2
q2 = 12*(0.050)2 / 9*109
(-40*10-9)
q2 = 0.03 / -360
q2 = -8.33*10-5 C
The second charge is q2 = -8.33*10-5
C
