Problem 20.34- Enhanced-with Feedback ?) 130115 (> Constants Part A One kind of

Question

Problem 20.34- Enhanced-with Feedback ?) 130115 (> Constants Part A One kind of e-book display consists of millions of very small spheres that float in a thin fluid layer What is the maximum possible torque on a sphere if the electric field is 4.7×105 N/C? plates two sphere is black on one side and white on the other, and possesses an electric dipole moment directed from the white side to the black. When an electric field is applied between the plates, the spheres rotate so that their dipole moment lines up with the field. Depending black or the white sides of the spheres can be made visible. The dipole moment of the spheres can be modeled as two opposite charges of magnitude 3.8 10 15 c separated by a distance of 100 ?m. Express your answer to two significant figures and include the appropriate units. on the field's direction, either the 13 Submit Incorrect Try Again; 9 attempts remaining Provide Feedback Next >

Explanation / Answer

Torque inside electric field is given by:

T = pxE = p*E*sin theta

p = electric dipole = q*d

T = q*E*d*sin theta

Using given values:

T = 3.8*10^-15*4.7*10^5*100*10^-6*sin 90 deg

T = 1.79*10^-13 N-m = 1.8*10^-13 N-m

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