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Three identical particles with the same charge q and mass m are held at the corners...

Three identical particles with the same charge q and mass m are held at the corners of an equilateral triangle with sides d as shown:

a) If all three particles are released simultaneously, what is their speed when they have traveled a large distance (effectively an infinite distance) from each other?

b) Suppose instead that the particles are released one at a time. The first one is released, and when it is at a large distance away the second one is released, and when that one is at a large distance away, the third one is finally released.      

       What are the final speeds of:

(1) the first released particle?

(2) the second released particle?

(3) the last particle?

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Answer #1

For case a) their final speed will be same for all the three charged particles due to symmetry of the particle arranged initially.

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