Energy to turn an electrostatic dipole

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Offline LB7

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Energy to turn an electrostatic dipole
« on: 23/11/2015 16:06:00 »
If I take an electrostatic dipole (+/-) and I place it on an arm. I turn the arm, the electrostatic dipole don't turn around itself. Far away, I see an electrostatic dipole that turns and I don't need any energy to turn the arm (without mass in theory).