In: Physics
Solution:-
apply the formula for electric field = (kQ)/r^2
k = 9*10^9
Q = -4.0 x 10^–9C
r = 0.5 m
then E = 144 N/C towards the charge.
The electric field direction about a negative source charge is always directed toward the negative source.
please upvote.thank you comment if you find any difficulty.