A source charge generates an electric field of 4286 n/c at a distance of 2.5 m. what is the magnitude of the source charge

To answer this question, we may use the formula,

E = kq / d^2

where E is our electric field, k is constant and is equal to (9 x 10^9) and d is distance in m. Substituting,

4286 = (9 x 10^9) (q) / (2.5 m) ^2

The value of q is 2.98 x10^-6 c.