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what is the magnitude of a point charge so chosen the electric field 75.0cm
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Magnitude of an electric field
E = k*q/r^2
Solve for q
q = E*r^2 / k
Plug in numbers
q = 2.30 N/C * (0.750 m)^2 / 9*10^9 N*m^2/C^2 = 1.44 * 10^-10 C
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