Initial data: q (value of the considered charge) = 0.0004 C; E (strength of a uniform electric field) = 10 kV / m (10 * 10 ^ 3 V / m).
The force that will act on the considered charge is equal to the product of the field strength and the magnitude of the charge: F = E * q.
Calculation: F = 10 * 10 ^ 3 * 0.0004 = 4 N.
Answer: A force of 4 N. acts on the charge under consideration.
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