INDEX. 



569 



Energy, Gauss's theorem of, 219 



kinetic, 109 

 ,, magnetic, 352 

 , , of magnetic field of currents, 436 

 ,, maximum theorem for, 223 

 ,, mutual, of magnets and currents, 



444 



,, mutual potential, 220 

 ,, mutual, of two currents, 428 

 ,, of polarized distributions, 239 

 ,, of system of conductors, 266 

 transfer of, 517 



unit of, 111 

 Eolotropic media, 510 

 Equation of activity, 125 



for steady flow, 334 



,, telegraphic, 533 

 generalcaseof,540 



Equations of condition, 92 

 of constraint, 103 

 ,, differential, of motion, 97 

 ,, of electromagnetic field for 



media at rest, 509 

 ,, of electromagnetism, 433 

 ,, of equilibrium of stressed 



body, 387 



,, of induction, 504 

 ,, of lines of force, 194 

 ,, for moving bodies, 555 

 of propagation, 512 

 Equilibrium, condition for, 104 



electrical, 253 



,, of stressed body, 387 



Equipotential layer, 165 



,, layers as screens, 289 



,, surface, 145 



Equipotentials, condition for infinite 



family of, 204 

 Everett, 101 

 Ewing, 375, 394 

 Extra-current, 471 



Factor, demagnetizing, 375 



Family of equipotentials, 204 



Farad, 416 



Faraday, 154, 243, 245, 251, 259, 335, 



382, 384, 389, 467, 469 

 Feddersen, 488 

 Field, electric, 244 



,, energy in terms of, 221 



of current, magnetic energy of, 436 



Field, magnetic, 351 



,, due to polarization of sphere, 372 

 ,, strength of, 144 

 Field-magnet, 453 

 Flow, steady, in conductors, 325 



variable, 398 

 Flux of force through circuit, 440 



of vector, 68 

 Flux-function, 195 



for magnetic induction, 



460 



Force, centrifugal, 138 

 coercive, 394 

 ,, on conductor carrying current, 



426 



electrical, law of, 248 

 electromotive, 330 

 ,, ,, of induction, 469 



,, of induction, lo- 



calized, 503 



,, equations of lines of, 194 

 ,, flux of through circuit, 440 

 ,, impressed, 97 

 of inertia, 108 

 law of electrical, 248 

 lines of, 145 



,, magnetic, due to current, 409, 436 

 ,, magnetomotive, 453 

 ,, mechanical, on element of cur- 

 rent, 426 

 tubes of, 260 

 unit of, 100 

 ,, unit tube of, 154 

 Forces acting on polarized body, 381 

 ,, elementary, various resolutions 



into, 430 



,, mechanical, on conductors, 440 

 Force-function, 110 



,, Newtonian, 111 



Formulae, symbolic, 435 

 Fourier, 98, 183, 326, 523 



series of, 183 

 Fourier-Ohm law, properties of vectors 



obeying, 330 

 Free charge, 246 

 Freedom, degrees of, 92 

 Frequency, 479 

 Function, algebraic, 14 

 analytic, 81 



of complex variable, 80; on 

 surface, 196 



