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Two point charges -7 μC and -2 μC are located at the origin and a point...

Two point charges -7 μC and -2 μC are located at the origin and a point (0.18 m, 0) respectively. Find the electric field due to these charges at a point (0.39 m, 0).
a.) E=______ V/m
b.)What is the electric potential at this point?
V=_____V
c.) Find the force acting on a point charge of 5 μC located at this point.
F=______N

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