Three point charges occupy the corners of an equilateral triangle of side 0.25 m:…

PHYSICS · Subjective · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

Three point charges occupy the corners of an equilateral triangle of side 0.25 m:

q_1 = +3.0\,\mu\text{C}

(top),

q_2 = -2.0\,\mu\text{C}

(lower left), and

q_3 = +4.0\,\mu\text{C}

(lower right). A fourth charge

q_4 = +1.5\,\mu\text{C}

is brought from infinitely far away to the center of the triangle. Determine the magnitude of the external work required to place

q_4

at the center.