Four identical particles (charge Q=5.4 nC, mass m = 2 g) are placed at corners of a square of side b = 7.6 cm. What is the electric potential energy of this system? (The electric potential energy is zero when the particles are very far apart.)

The particles are now released from rest. What is the speed of each particle when they are very far apart? (You may ignore gravity.)

e) none of the above answers are correct

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