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4. At right, the point charges 2 4x are fixed on the y axis Note In this problem, let k 1/4neo a. Show that the magnitude of the resultant electric field at point P can be expressed in the form: Ep (2kg/x2) ( (a2/x2)-5/2 - 1) b. Show that in the case where x >» a the magnitude of resultant electric field at point P can be approximated by Hint: make use of the approximation (1 + α)N is valid if α << 1 1 + Να which

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