If we consider a point charge q at a distance from a test charge qo, we can find the magnitude of electric force on the test charge using Coulomb's Law. Recall that k is a proportionality constant, sometimes called the Coulomb constant. In SI units, it is equal to 8.99 x 10 Nm/c. lallal 12 Since the magnitude of the electric field at this point is defined as E - F/4, we can see that the magnitude of the electric field due to the charge g at position is as follows. E-k lal If q is positive, the electric field at Ppoints radially outwards from q. 90 E If q is negative, the electric field at Ppoints radially inwards toward q. 90 We can consider the direction of the electric field produced by a point charge by placing a positive test charge at point P near the charge. If the point charge is positive, it will repel the test charge, and if the point charge is negative, it will attract the test charge. Calculate the magnitude of the electric field 0.100 m away from a 4.00 C charge. (Enter your answer in N/C.)