By Andrew Zangwill

ISBN-10: 0521896975

ISBN-13: 9780521896979

An attractive writing type and a powerful specialize in the physics make this accomplished, graduate-level textbook special between present classical electromagnetism textbooks. Charged debris in vacuum and the electrodynamics of continuing media are given equivalent realization in discussions of electrostatics, magnetostatics, quasistatics, conservation legislation, wave propagation, radiation, scattering, exact relativity, and box idea. vast use of qualitative arguments just like these utilized by operating physicists makes smooth Electrodynamics essential for each pupil of this topic. In 24 chapters, the textbook covers many extra themes than may be offered in a standard two-semester path, making it effortless for teachers to tailor classes to their particular wishes. as regards to a hundred and twenty labored examples and eighty functions containers support the reader construct actual instinct and improve technical ability. approximately six hundred end-of-chapter homework difficulties motivate scholars to have interaction actively with the cloth. A options guide is offered for teachers at www.cambridge.org/Zangwill.

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**Example text**

Sporadic and often contradictory reports of this peculiar phenomenon appeared for centuries. Then, in 1600, William Gilbert dismissed all of them as “esoteric, miracle-mongering, abstruse, recondite, and mystical”. His own careful experiments showed that many materials, when suitably prepared, produced an “electric force” like amber. Electrical research was revolutionized in 1751 when Benjamin Franklin postulated that rubbing transfers a tangible electric “fluid” from one body to another, leaving one with a surplus and the other with a deficit.

13) The continuity equation says that the total charge in any infinitesimal volume is constant unless there is a net flow of pre-existing charge into or out of the volume through its surface. 1 Moving Point Charges Let N point charges qk follow trajectories rk (t). 6): N qk δ(r − rk (t)). 14) k=1 We can use the continuity equation to derive the corresponding current density. The particle velocities are υ k (t) = r˙ k (t), so the chain rule gives ∂ρ = ∂t qk k ∂ δ(r − rk ) = − ∂t qk υ k · ∇δ(r − rk ).

3 tells us that ∇ 2 W = 0 also. 79) with φ = ψ = W (W is any Cartesian component of W) takes the form d 3 r |∇W |2 = V dS · W ∇W. S FOR ENDORSEMENT PURPOSES ONLY. 183) goes to zero when C(r) behaves at infinity as indicated above. Therefore, ∇W = 0 or W = const. But W → 0 at infinity so W = 0 or C1 = C2 as required. 10 Lagrange Multipliers Suppose we wish to minimize (or maximize) a function of two variables f (x, y). The rules of calculus tell us to set the total differential equal to zero: df = ∂f ∂f dx + dy = 0.

### Modern electrodynamics by Andrew Zangwill

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