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C Physics ( 5 CFU ) Finalità

To stress and clarify the importance of the method of Physical Sciences and to help acquiring the knowledge of classic electromagnetic phenomena highlighting today applied physics resources.

Programma

the electric charge and the matter; conducting and insulating materials

Coulomb’s law; static electric field E

comparison between electric and gravitational interactions

motion of charged particles in static electric fields

flux of the electric field

correlations between Gauss and Coulomb laws

E calculations by using Gauss’s law

conservative fields and potential energy

the electric potential; electric potential calculations

electric fields and electric potentials;

constant potential surfaces and vector lines of the electric fields.

electrostatic properties of conducting materials

correlation between charge and electric potential

capacitors; capacity calculations; the concept of equivalent capacity

electric energy inside capacitors

energy density of an electric field

electrostatic properties of insulating materials (dielectric constant)

electric current and density of electric current

charge flux and effective speed of carriers

resistance in conducting materials; Ohm’s law; conductance and specific resistance

temperature dependence of the specific resistance

microscopic aspect of the Ohm’s law (the Drude model)

non-ohmic materials: semiconductors and superconductors materials

electromotive force

electric energy and electric power; energy balance

the concept of equivalent resistance; parallel and series configurations

The laws of d.c. circuits

Measurements of current intensity and of differences of electric potentials; RC circuits

introduction to magnetic interactions (see Mazzoldi p.227)

the magnetic field B; the magnetic force

Lorentz’s force; motion of charged particles in static electric and magnetic fields

Hall effect

Cyclotron

Magnetic forces on conducting wires and rings

magnetic dipole moment

potential energy of a conducting ring in magnetic field

interactions between magnets and conducting rings

magnetic field due to a charges flux

The Biot-Savart’s law

Interactions between parallel conducting electric wires;

Electromagnetic gun

The Ampere’s law and magnetic field calculations

induced electric currents: Faraday’s law; Lenz’s law

e.m. induction and energy exchanges

induced electric fields

inductance; magnetic flux and induced current

self induced electromotive force;

RL circuits; magnetic energy density

calamite

the magnetic flux and the Gauss’s law for magnetic fields

terrestrial magnetic field

magnetic fields inside the matter; magnetism and electrons

magnetic materials: dia- para- and ferro-magnetic materials

induced magnetic fields; displacement current

Maxwell’s equations

LC oscillations and damping

a.c. currents

forced oscillations e resonance

RLC (series) circuits

electric power in a.c. circuits; transformers

waves (see Mazzoldi p. 465)

the spectrum of e.m. waves;

wave motion

energy transfer; Poynting’s vector

radiation pressure

polarization;

reflection and refraction;

chromatic dispersion

total reflection;

Brewster’s law

energy preservation in light reflection and refraction (see Mazzoldi p. 578);

Lambert ‘s law on wave intensity attenuation (see Mazzoldi p. 544)

interference;

diffraction;

Young’s experiment; coherence

Interference phenomena from thin layers

Attività d'esercitazione

Joint exercises in class (45%) and individual tests (5%) (in itinere) directed to solve and clarify problems and questions accurately selected among the most suitable to verify correct learning of lectures (50%).

Modalità d'esame

With “in itinere” positive results votation will be assigned at the of semester and recorded within January. Otherwise the assessment method consists of a selective written exam and (when required by the examining staff) an oral discussion.

Propedeuticità

PHYSICS A-B

Testi consigliati

Halliday, Resnick, Walker "Fondamenti di FISICA" (El-Magn-Ottica) V edizione, Casa Editrice Ambrosiana, Milano.

Mazzoldi, Nigro, Voci "FISICA" Vol. II, EdiSES, Napoli.

Mazzoldi, Nigro, Voci "FISICA" Vol. II, EdiSES, Napoli.