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Magnitude/Direction of Electric Field

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Using the attached diagram, please help me with the following.

(a) Find the magnitude/direction of the electric field at the center of the configuration of charges.
(b) Using the result from (a), find the magnitude and direction of the force on an electron placed at the center of the configuration.

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The expert examines magnitude directions of an electric field.

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Here are some general explanations to help in understanding the solutions.

The electric field is given by the equation:
E = kQ / d^2

This is where k is Coloumb's law-- constant = 9x10^9 Nm^2/C^2
You'll notice that I ...

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