One kind of e-book displayed consists of millions of very small spheres that flo

Question

One kind of e-book displayed consists of millions of very small spheres that float in a thin fluid layer between two conducting, transparent plates. Each sphere is black on one side and white on the other, and possesses an electric dipole moment directed from the white side to black. When an electric field is applied between the plates, the spheres rotate so that their dipole moment lines up whith the field. depending on the field's direction, either the black or the white sides of the spheres can be made visable.
The dipole moment of the spheres can be modeled as two opposite charges of magnitude 3.5 x 10^-15 C, seperated by a distance of 100um. What is the maximum possible torque on a sphere if the electric field between the transparent plates is 4.0 x 10^5 N/C?

Explanation / Answer

Here,

max torque = pE sin 90

max torque = 3.5 * 10^-15 C * 100 * 10^-6 m* 4* 10^5 = 1.4 * 10^-13 Nm

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