Calculate the magnitude of the electric field at a field point 3.0m from a point charge, q=5.0uC
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the equation for electric field a distance r away from a point charge is represented as Kq/r^2 where K is coulomb's law constant, q is the charge, and r is the radius (or distance). You can now plug in your values into the equation. Remember that K is 1/(4πε0).