Answer:
The magnitude of the net electric field inside the solution is 3.704 N/C
Step-by-step explanation:
Given;
average drift speed, v = 3 x 10⁻⁷ m/s
mobility of the bromide ions, μ = 8.1 x 10⁻⁸ (m/s)(N/C)
The magnitude of the net electric field inside the solution is given by the equation below;

where;
E is the magnitude of the net electric field inside the solution
Substitute the given values and solve for E

Therefore, the magnitude of the net electric field inside the solution is 3.704 N/C