A particle of mass m carrying charge q is projected with velocity (v) from point P towards an in...

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A particle of mass m carrying charge q is projected with velocity (v) from point P towards an infinite line charge from a distance a. Its speed reduces to zero momentarily at point Q which is at a distance a/2 from the line charge. If another particle with mass m and charge -q is projected with the same velocity v from point P towards the line charge. Its speed is found to be \(\frac{Nv}{\sqrt 2}\) at point Q.Find the value of N.
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