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8. In a certain region, the electric potential due to a charge distribution is given by the equation Vx.y.a) 3x2y2+ yz3 2z3x, where x, y, and z are measured in meters and V’is in volts. Calculate the magnitude of the electric field vector at the position (x)に)-(1.0, 1.0, 1.0). A sphere with radius 2.0 mm carries +1.0 μC of charge distributed uniformly throughout its volume. What is the potential difference, VB- VA, between point B, which is 4.0 m from 식 9, the center of the sphere, and point A, which is 9.0 m from the center of the sphere? (k= 1/4zzo = 8.93x 109 N·m2/C2)