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Electric Potential

Several charges in the neighborhood of point P produce an electric potential of 6.0 kV (relative to zero at infinity) and an electric field of 36i N/C at point P. Determine the work required of an external agent to move a 3.0-μC charge from infinity to point P (without any net change in the kinetic energy of the particle) along the x axis
a . 21 mJ
b. 18 mJ
c. 24 mJ
d. 27 mJ
e. 12 mJ
The correct answer is b
can someone please tell me how to get the right answer
work required of an external agent to move a 3.0-μC charge from infinity to point P (without any net change in the kinetic energy of the particle) along the x axis
= charge x potential = 3.0 x 10^-6 x 6 x 10^3= 18 x 10^-3 J = 18 mJ

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