(e) The electric field E at vector r away from a charge q is 이 r E = 4лεr² r where r is the length of the vector. If two positive unit charges, q₁ and 92 are placed at (-0.5, 0, 0) and (0.5, 0, 0) respectively, by summing the vectors obtain the field at (0, 1.5, 0). What is the force experienced by a charge of -2 placed at this position? [4]

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