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Three charges each of value q are placed...

Three charges each of value q are placed at the corners of an equilateral triangle. A fourth charge Q is placed at the center of the triangle.
a. Find the net force on charge q.
b. If `Q = -q`, will the charges at the corners move toward the center or fly away from it ?
c. For what value of Q and O will the charges remain stationary ?
d. In situation (c), how much work is done in removing the charges to infinity ?

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