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Physics Electrostatics Level: High School

Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in the figure at “click here”

If a charge of -2.00uC is placed at this point , what are the magnitude and direction of the force on it ? There are three charges ; 6.00 uC with 3.00 cm distance from the next charge of 1.50uC and then 2.00cm to the next charge-2.00uC .