Answer:
The magnitude of the electric field is 129375 N/C toward south.
Step-by-step explanation:
Given that,
Electric force

(A). We need to calculate the magnitude of the electric field
Using formula of electric field


Where, q = charge of proton
E = electric field


(B). The direction of the electric field is toward the direction of the force.
So, The direction of the electric field is toward south
Hence, The magnitude of the electric field is 129375 N/C toward south.