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V=6x-8xy^2-8y+6yz-4z^2-4x^2. E = - (partial diff of V with x + partial diff of V with y + partial diff of V with z) = - ( (6 - 8y^2 - 8x) + (-16xy - 8 + 6z) + ( 6y-8z)) now since particle is at origin hence x,y,z =(0,0,0) E = -(6-8) = -(-2) = 2 so force acting =qE = 2*2 = 4N
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