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Two point charges of −Q and Q are fixed at x=−a and x=a on the x...

Two point charges of −Q and Q are fixed at x=−a and x=a on the x axis, respectively as shown in Figure 1. Another point charge of q and mass m is released at x=x0 at rest and it is free to move. Find a) the electric field vector, −→E (both magnitude and direction) at any x and b) the ultimate speed of particle of mass m.

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