Electric Elasticity (66) When an electromotive force acts on a dielectric, it puts every part of the dielectric into a polarized condition in which <s>even<\s> its opposite sides are oppositely electrified The amount of this electrification depends on the electromotive force and on the nature of the substance, and, in solids having a structure defined by axes, on the direction of the electromotive force with respect to these axes. In isotropic substances if k is the ratio of the electromotive force to the electric displacement we may write the Equations of Electric Elsaticity P = +kf Q = +kg R = +kh (E) Electric Resistance (67) When an electromotive force acts on a conductor it produces a current of electricity through it. This effect is additional to the electric displacement already considered. In solids of complex structure the relation between the electromotive force and the current depends on their direction through the solid. In isotropic substances, which alone we shall here consider, if [rho] is the specific resistance referred to unit of volume, we may write the Equations of Electric Resistance P = [rho]p Q = [rho]g R = [rho]r (F)
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Manuscript details
 Author
 James Clerk Maxwell
 Reference
 PT/72/7
 Series
 PT
 Date
 1864
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Cite as
J. C. Maxwell’s, ‘Dynamical theory of the electromagnetic field’, 1864. From The Royal Society, PT/72/7
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