Aflat carpet acquires a uniformly distributed charge of after you and your friends walk across it several times. A dust particle is suspended in midair just above the center of the carpet. What is the charge on the dust particle?
The charge on the dust particle is.
The charge density by dividing the chargeby the area,
To calculate the electric field, multiply the charge density by the temporal permittivity constant.
To calculate the charge of a dust particle, multiply the mass times gravity by the electrical field.
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 is from a small ball charged to , 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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