CODE  72362 

ACADEMIC YEAR  2024/2025 
CREDITS 

SCIENTIFIC DISCIPLINARY SECTOR  FIS/01 
LANGUAGE  Italian 
TEACHING LOCATION 

SEMESTER  2° Semester 
MODULES  Questo insegnamento è un modulo di: 
TEACHING MATERIALS  AULAWEB 
OVERVIEW
The course is designed for firstyear students of Electrical Engineering and Chemical Engineering. The topics relate to the classical electromagnetism from the electric field to Faraday's law, including the RL circuit. Excluded from the course are oscillating circuits, AC circuits and electromagnetic waves.
AIMS AND CONTENT
LEARNING OUTCOMES
In this module the main concepts and fundamental laws of electromagnetism in vacuum are provided and various applications analysed.
AIMS AND LEARNING OUTCOMES
The specific training objective is to provide the student with the ability to solve elementary but concrete problems. This implies that the student must know how to distinguish between fundamental concepts (electric and magnetic fields and forces, works, Gauss's laws, Ampere's, Faraday's, ...) and more specific issues (motion of charges in electromagnetic fields, cylindrical condensers, .. .) demanding a thorough understanding of fundamental concepts.
TEACHING METHODS
Lectures on the blackboard.
SYLLABUS/CONTENT
Introduction to the course, recalls (vectors, significant digits, units).
Electrical phenomena. Coulomb's law. Exercise: comparison between electrostatic and gravitational force. Superposition principle.
The electrostatic field for point charge, discrete distribution, continuous distribution. Exercise: electrostatic field of a charged ring. Exercise: electrostatic field of a charged disk, infinite R limit. Electrostatic field of two charged infinite planes. Field lines.
The work of the electrostatic field: potential and potential energy for a point charge, a discrete system and a continuous system of charges. Exercise: potential and potential energy of a system of 3 point charges. Electric field as a gradient of potential. Exercises: potential of a uniform field, undefined parallel charged planes; potential of a charged ring. Potential of the charged disc.
Motion of a charge in an electric field, conservation of energy. Exercises: electron in a uniform field; classic model of the Bohr atom; electrostatic separator.
The electric dipole. V and E. Forces on a dipole immersed in E (uniform). Torque and energy.
Construction of the concept of flow of a vector field with the analogy of fluid physics. Flow of the electrostatic field. Gauss theorem and proof only in the case of spherical surface and pointlike charge. Exercises: E and V of a superficial spherical charge distribution; E and V of a uniformly charged sphere; E and V of a uniformly charged cylinder; E and V of an infinite charged plane.
Conductors in equilibrium electrostatic, conductors with cavities, charge inside cavities, electrostatic induction.
Capacitors. Spherical, flat, cylindrical capacitors. Electrostatic energy of a capacitor, energy density. Capacitors in series and in parallel. Dipole oscillating in E.
Classic model for electrical conduction, drift velocity, current density, current. Ohm's law, Joule effect, series and parallel resistors, electromotive force. Kirchhoff's laws, charge and discharge of a condenser.
The magnetic field: empirical observations. Lorentz's force. Particle moving in uniform B, angular velocity. Examples: mass spectrometer; speed selector; cyclotron.
Force on a currentcarrying conductor and immersed in B; mechanical torque on a coil.
Magnetic field produced by a current (Laplace's law) and by a moving charge. Applications: rectilinear wire (BiotSavart law); circular coil. Applications: rectilinear solenoid. Forces between wires covered by current.
Ampère's theorem and demonstration in the case of rectilinear thread. Applications: wire field, rectilinear solenoid and toroidal solenoid.
The flow of B. Solenoidal fields.
Law of FaradayNeumannLenz. Continuous and alternate current generator. Law of Felici.
Selfinduction. Inductance of a solenoid, RL circuit, closing overcurrent. Magnetic energy. Mutual induction (outline).
Displacement current. Maxwell equations
RECOMMENDED READING/BIBLIOGRAPHY
P. Mazzoldi, M. Nigro, C. Voci, "Elementi di fisica  elettromagnetismo", EdiSES
D. Halliday, R.Resnick, J.Walker, “Fondamenti di Fisica” II ; Ed. CEA
TEACHERS AND EXAM BOARD
Ricevimento: Every day, by appointment via email.
LESSONS
LESSONS START
In the second semester, usually at the end of February
Class schedule
The timetable for this course is available here: Portale EasyAcademy
EXAMS
EXAM DESCRIPTION
The exam consistes in a written test and an oral examination
Written exam: the written test consists of two parts, Mechanics and Electromagnetism. Usually each test has a duration of 2 hours; it is not allowed to consult books or notes, but only the form used during the year (downloadable from the AulaWeb page).
The results of the writings for the individual parts are considered valid for one year (up to the same session of the following academic year).
Oral exam:
1. students who obtain in the two partial tests during the course, or at the exam sessions, an average of 15/30, with a minimum of 12/30 in each test are admitted to the oral exam.
2. The oral examination consists of an interview concerning the mechanical part and the electromagnetism part. Should one of the two interviews be considered insufficient, the oral exam will be considered as globally invalid and the student will have to repeat it in full (the written tests will still be held valid).
ASSESSMENT METHODS
The written exam will evaluate the ability to: i) interpret the text of the proposed exercise and outline the problem; ii) identify the physical laws involved and the related equations to be applied; iii) quantitatively resolve the exercise; iv) evaluate the reasonableness of the numerical result obtained.
In order to evaluate the written test, the following parameters will be taken into account: the correct setting of the exercise, the correctness of the literal solution obtained, the congruence of the numerical solution obtained.
The oral exam will allow to ascertain the ability to: i) introduce the requested topic with language properties; ii) describe simple applications of the physical laws under consideration.
In order to evaluate the oral exam, the following parameters will be taken into account: the level of understanding of the topic, the quality of the presentation, the correct use of the specialist vocabulary, the capacity for critical reasoning.