EM 2014

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Contents


Electricity and Magnetism

Homeworks and exams have been deliberately suppressed from this online listing.

Instructor: Dr. [Sabieh Anwar] Office hours: are Tuesday and Friday, 2 to 3 pm..

Teaching Instructors: [Noor-ul-hira Shaukat],[Anusha Shahid], [Danish Shahzad], [Muhammad Zaki Jawaid], [Rahma Nawab], [Mohsin Ali Mazhar]. Tutoring sessions. Textbooks: Physics for Scientists and Engineers by Serway/Jewett. (Primary textbook); Matter and Interactions by Chabay and Sherwood. (Useful complementary book) Course outline: Click here for the course outline.

Schedule for Tutoring Sessions -- Fall 2014

Teaching AssistantTimeDayVenue
Noor-ul-hira Shaukat 01:00 PM - 03:00 PMTuesdayPhy. conference room.
Anusha Shahid 02:30 PM - 04:30 PMMondayPhy. conference room.
Danish Shahzad 02:00 PM - 04:00 PMTuesdayPhy. conference room.
Mohsin Ali Mazhar 11:00 AM - 01:00 PMWednesdayPhy. conference room.
Muhammad Zaki Jawaid 01:00 PM - 03:00 PMWednesdayPhy. conference room.
Rahma Nawab 09:30 AM - 11:30 AMThursday Phy. conference room.

Pre-mid term

Electric Fields (2 lectures)

Click here to see the Wimshurst machine. in action.
Click here to see the Wimshurst machine. in action.
  • Electric charge
  • Coulomb's law
  • Electric field due to point charges
  • Electric dipole
  • Electric field due to distributed charges; electric field due to a charged rod (1D problem), electric field due to uniformly charged disk (2D problem)
  • Recitation: (date=8 September 2014; 11:30 am - 12:45 pm)

Gauss's Law and its Applications (3 lectures )

  • Electric flux
  • Gauss's law
  • Flux due to a point charge
  • Electric field due to spherically symmetric charge distribution and linear charge distribution using Gauss's law
  • Electric field due to an infinite sheet of charge
  • Electric field inside conductor

Note: Microsoft Silverlight (a freeware) is required to view the videos.

Video recordings:

Electric charge, Coulomb's law, electric field, retardation: Part A | Part B

Electric dipole, electric field due to a charged rod, electric field due to uniformly charged disk (part A): [1] part B: [2]

Electric flux, Gauss's law, flux due to a point charge (part A): [3] part B: [4]

Application of Gauss's law to spherically symmetric charge distribution and linear charge distribution.[5]

Field due to an infinite sheet of charge, fields inside conductor (part A): [6] part B: [7]


Electric potential (2 lectures)

Van de Graaff Generator.
Van de Graaff Generator.
  • Electric potential and potential difference
  • Electric potential due to a point charge
  • Different facets of electric potential


Video recordings:

Electric potential, potential difference, electric potential due to point charge: [8]] [Sorry, Part B could not be recorded due to a technical fault.]

Different facets of electric potential (part A): [9] part B: [10] [Sorry, 20 minutes of audio in part B is missing.]



Capacitors and Dielectrics (2 lectures)

  • Definition of capacitance.
  • Capacitors with dielectrics
  • Parallel-plate capacitors, the cylindrical capacitor
  • Energy stored in a charged capacitor
  • Combinations of capacitors

Video recordings:


Definition of capacitance, capacitors with dielectrics. [11]

Energy stored in a charged capacitor, combinations of capacitors (part A): [12] part B: [13] part C: [14]

Review session on Gauss's law (part A): [15] part B: [16] part C: [17]


Current and Resistance (4 lectures)

Finding the temperature dependence of a thermistor.
Finding the temperature dependence of a thermistor.


  • Defining the electric current
  • Ohm's law
  • Drift velocity
  • Temperature dependence of resistivity
  • Electrical feedback
  • kirchhoff's law

Video recordings:


Defining the electric current, relation between current and velocity of charge carriers.(part A): [18] part B: [19]

Ohm's law, drift velocity, temperature dependence of resistivity [20]

Electrical feedback, Kirchhoff's current law. (part A): [21] part B: [22]

Charge distribution on the surface of current carrying conductors, what is a resistor, Kirchoff's voltage law. (part A) :[23] part B: [24]



Midterm review. (part A): [25] part B: [26] part C: [27]


Post-mid term

Sources of Magnetic Fields (1 lecture)

Oersted's 1820 Experiment: Observing magnetic effects of currents for the first time.
Oersted's 1820 Experiment: Observing magnetic effects of currents for the first time.
  • Demonstration on Oersted's Discovery: [28]
  • Sources of Magnetic Fields
  • Magnetic Fields due to moving charges
  • Biot Savart law
  • Magnetic Field due to current carrying loops


Video recordings:


Magnetic field due to moving charges, Biot-Savart Law: [29]


Forces on moving charges inside a Magnetic Field (2 lectures)

Observing the Magnetic force between two current carrying conductors.
Observing the Magnetic force between two current carrying conductors.


Video recordings:

Magnetic Dipoles, Electrons inside an atom, Force on a moving charge inside a magnetic field: [32]

Cyclotron, Force between two current carrying wires: [33]


Ampere's Law, Hall Effect, Magnetic Torque and Energy (2 lectures)

  • Ampere's Law
  • Applications of Ampere's Law (Solenoid, Toroid, Infinite current sheet)


  • The Hall Effect
  • Forces and Torques on Dipoles
  • Potential Energy of a Dipole inside a Magnetic Field
  • Force between two Magnetic Dipoles


Video recordings:

Ampere's Law and its applications: [34]

Hall Effect, Magnetic Torque and Potential Energy: [35]




Magnetic Materials (3 lectures)

Detecting the emf generated across a conductor moving through a uniform magnetic field.
Detecting the emf generated across a conductor moving through a uniform magnetic field.
  • Motional EMF. Demonstration: [36]
  • Magnetic Materials: Phenomenological Approach
  • Paramagnetic and Dimagnetic materials


Video recordings:

Motional EMF and Phenomenological Approach to Magnetic Materials: [37]

Origin of Paramagnetism: [38]

Origin of Diamagnetism and Ferromagnetism: [39]



Time-varying Magnetic and Electric Fields (4 lectures)

  • Magnetic Induction and Faraday's Law
  • Lenz's Law
  • Application: Magnet Moving near a Superconducting Coil, eddy currents, magnetic braking, skin effect
  • Tutoring session 12: Time-varying Magnetic and Electric Fields
  • Capacitors and RC Circuits.
  • Demonstrating the behavior of an RC Circuit: [40]
  • Displacement Current: The Maxwell-Ampere's Law
  • The Complete Maxwell Equations
  • Inductance and RL Circuits
  • Demonstration on Electromagnetic Induction and Faraday's Law : [41]
  • Energy Flow in Simple DC circuits
  • Poynting Vector


Video recordings:

Magnetic Induction and Faraday's Law: Part A [42], Part B [43] and Part C [44]

Lenz's Law, Eddy Currents and Skin Effect: [45]

RC and RL Circuits, Displacement Current and the complete Maxwell's Equations: [46]

Energy Flow in Simple DC Circuits and the Poynting Vector: [47]



150 Years of Maxwell's Equations

  • The Long Road to Maxwell's Equations: [48] Author: James C. Rautio. Published in IEEE Spectrum (December 2014).

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