Three charges of + 122 mC each are placed on the comers of an equilateral triangle, 1.72 m on a side. If energy is supplied at the rate of 831 W. how many days would be required to move one of the charges onto the midpoint of the line joining the other two?
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Initial electrostatic energy of system of three charges is
Ui=34πε01rq2=3×9×109×1(0.1)2=2.7×108J
When charges A is moved to new position A′, Which is midpoint of side BC, then final electrostatic energy is
Uf=4πε01(r12q1q2+r23q2q3+r13q3q1)
=4πε01[A′Bq2+BC
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