By Alessandro Bettini

Focusing on electromagnetism, this 3rd quantity of a four-volume textbook covers the electrical box less than static stipulations, consistent electrical currents and their legislation, the magnetic box in a vacuum, electromagnetic induction, magnetic strength lower than static stipulations, the magnetic houses of subject, and the unified description of electromagnetic phenomena supplied via Maxwell’s equations.

The four-volume textbook as an entire covers electromagnetism, mechanics, fluids and thermodynamics, and waves and light-weight, and is designed to mirror the common syllabus through the first years of a calculus-based collage physics application.

Throughout all 4 volumes, specific cognizance is paid to in-depth rationalization of conceptual facets, and to this finish the ancient roots of the important techniques are traced. Emphasis can be regularly put on the experimental foundation of the recommendations, highlighting the experimental nature of physics. each time possible on the common point, techniques correct to extra complex classes in quantum mechanics and atomic, reliable nation, nuclear, and particle physics are incorporated.

The textbook deals an awesome source for physics scholars, academics and, final yet now not least, all these looking a deeper figuring out of the experimental fundamentals of physics.

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**Additional info for A Course in Classical Physics 3 — Electromagnetism**

**Sample text**

The answer must be given by experiments, and is positive. Notice that this is not at all a priory obvious. A counter example is given by the electric charges in motion. The forces they exchange, as we shall see in Sect. 6, do not obey the second Newton law. Consider now a point charge q0 at rest at r0 and a number, say n, of other charges, which are point like and at rest too, say q1 at r1, q2 at r2, q3 at r3 … qn at rn. It is experimentally found that the superposition principle holds for the electrostatic forces, namely that the total force is the sum of the forces that each charge would exert if acting alone.

The concept of ﬁeld becomes more useful when we deal with sources more complex than a single charge. Indeed, Eq. 11) tells us that the force felt by the charge q0 in the presence of n other point charges is also the product of q0 and of a vector independent of q0, which we shall again call the electric ﬁeld, namely 14 1 Electrostatic Field in a Vacuum F ¼ q0 Eðr0 Þ ð1:16Þ with Eðr0 Þ ¼ n 1 X qi u : 2 i0 4pe0 i¼1 ri0 ð1:17Þ We recognize the right-hand side immediately as being the sum of terms as in Eq.

King (USA, 1925–2014)2 established the neutrality of both hydrogen molecules and helium atoms, obtaining limits of a few 10−20 qe. Let us examine the consequences of both hydrogen molecules and helium atoms being neutral. Both of them contain two protons and two electrons (we ignore the two neutrons of helium, which are neutral). However, in the molecule, protons and electrons have “atomic” kinetic energies on the order of the electronvolt. In helium, the electrons have similar energies, but the protons are inside the nucleus, where the kinetic energies are on the order of the MeV, namely a million times larger.