1. The problem statement, all variables and given/known data In a certain region of space, the electric potential along the x-axis is given by: V = 111x3 - 517x - 258 where V is in Volts and x is in meters. Find the force F (magnitude in N and direction) felt by a -444 μC point charge at point (56.5 cm,0). (For direction, all you need is the sign.) 2. Relevant equations E=dV/dx F=qE 3. The attempt at a solution dV/dx=d/dx(111x3-517x-258=333x2-517-258=E ⇒ E(0.565m)=-668.7 N/C ⇒F=qE=(-444*10-6)*(-668.7)≅0.297 The answer turned out to be wrong so if someone can give me a hint towards where my mistakes are I would greatly appreciate it!