The magnitude of the electric filed strength is -1.44 * 10^-3 N/C away from the electron.
The electric field strength refers to the level of impact that a charge has on another charge in its vicinity. Now you have to know that the electric filed intensity depends on the magnitude of the charge and the force that is exerts on another charge.
Thus;
E = Kq/r^2
K = electric constant
q = magnitude of the charge
r = distance
E = 9.0 * 10^9 * -1.6 * 10^-19/1 * 10^-6
E = -1.44 * 10^-3 N/C
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