The point x = 0 is the midpoint between the two positive charges. The electric field is zero at this point.
E = Ea + E-a
Two positive point charges q are placed on the x-axis, one at x = a and one at x = -a.
(a) Find the magnitude and direction of the electric field at x = 0.
(b) Derive an expression for the electric field at points on the x -axis. Use your result to graph the x-component of the electric field as a function of x, for values of x between -4a and +4a.
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