Electric force on a charged particle:
Electric field, E, due to a dipole:
An electret is similar to a magnet, but rather than being permanently magnetized, it has a permanent electric dipole moment. Suppose a small electret with electric dipole moment 1.0 × 10−7 Cm is 25 cm from a small ball charged to + 80 nC, with the ball on the axis of the electric dipole.What is the magnitude of the electric force on the ball?
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