42. [II] Three point-charges are placed at the corners of an isosceles triangle. At the left...

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42. [II] Three point-charges are placed at the corners of an isosceles triangle. At the left and right, end points of the base are +1.0 μC and +1.0 μC, respectively, and at the vertex +3.0 μC. The base of the triangle is 40 cm long, and the altitude is 30 cm high. Find the E-field at the midpoint of the baseline. 42. [II] Three point-charges are placed at the corners of an isosceles triangle. At the left and right, end points of the base are +1.0 μC and +1.0 μC, respectively, and at the vertex +3.0 μC. The base of the triangle is 40 cm long, and the altitude is 30 cm high. Find the E-field at the midpoint of the baseline.