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## Fields: Gravity, Electricity, and Magnetism—PHYS 2113

Section 1: MWF 9:30am-10:20am in Nicholson 109

Office hours: MWF 2pm-3pm in Nicholson 447 (please email before coming)

**Textbook**: Fundamentals of Physics, by Halliday, Resnick, and Walker, 9th edition (Wiley).

**Homework**:
A homework assignment consisting of 15-20 problems and a few questions from the text will be assigned on WebAssign once per week. It will be due on Fridays at 5:00PM. Your login name will be your PAWS login name, and your password will be your LSU ID number. The first assignment is available on WebAssign and is due 11:59PM FRI 29 AUG 2014.

WebAssign Class Key for Section 1: lsu 7071 4383

**Tutoring**:
Free physics tutoring is offered in Nicholson 102 and Middleton 141. The hours are posted here.
Up to 900 minutes of free online tutoring offered here through your PAWS account.
Private tutors (not free) can be found here.
Academic Center for Student-Athletes, Student Learning Program and free tutoring in Tutorial Center.

**Mid-term exams**:

Exam I: 6:00-7:00PM TUE 16 SEP 2014

Exam II: 6:00-7:00PM TUE 14 OCT 2014

Exam III: 6:00-7:00PM TUE 11 NOV 2014

**Exam Solutions**: Will be posted on the Main PHYS2113 Web Page.

**Calculators**: During your test, the only electronic device you may have with you at your seat is a scientific or graphing calculator. You may not use the calculator app on your smartphone or tablet. You may not have your cell phone, tablet, smartphone, PDA, pager, digital camera, computer, or any other device capable of taking pictures or video, sending text messages, or accessing the Internet. This means not just on your person, but also not close enough to you that you could reach it during the test. Any student found with such a device during an exam will be assumed to be violating the LSU Honor Code and will be referred to the Dean of Students for Judicial Affairs. In addition the device will be confiscated.

**There will be no make-up exams!** If you have to miss an exam and you have a valid and documented excuse, as per LSU Student Policy 22, you will be allowed to substitute the grade on that exam for the average of your other exam grades (midterm and final exams).

**Final Exam**: 5:30-7:30PM MON 08 DEC 2014

**Grading**:

Midterms - 100 points each (for 300 points total)

Final Exam - 200 points

Homework - 75 points

In Class Quizzes - 25 points

Total:
600 points

Your numerical grade will be the total number of points you obtain, divided by 6.0.
Given your numerical grade, your letter grade will be at least the following:

A: 90-100 B: 75-89 C: 60-74 D: 50-59 F: <50

### Exam Solutions

### Lectures

- energy transport by EM waves
- Poynting vector
- intensity

- electromagnetic waves
- Maxwell's equations in free space

- Maxwell's equations
- spin angular momentum and orbital angular momentum
- diamagnetism, paramagnetism, and ferromagnetism

- Gauss' law for magnetic fields
- Maxwell's law of induction

- RLC circuits
- damping
- AC generators, resistors, inductors, and capacitors

- LC circuits
- comparison with mass on a spring
- time-varying current and charge in an LC circuit

- inductors and inductance
- RL circuits

- review of Faraday's law of induction
- induction and energy transfer
- changing magnetic field induces an electric field

- induction (motivating experiments)
- Faraday's law of induction

- solenoids and toroids
- current carrying coil behaves like a magnetic dipole

- review of two right-hand rules
- force between 2 parallel currents
- Gauss' law for magnetism
- Ampere's law

- magnetic field induced by a moving charge
- Biot-Savart law (magnetic field induced by a current carrying wire)
- calculating the induced magnetic field by applying Biot-Savart law and principle of superposition

- Lorentz force law rewritten in terms of current and length vector
- force on a curved current carrying wire
- torque on a current loop

- Hall effect (magnetic field and current induce an electric field)
- circulating charged particles

- magnetic fields
- bar magnets
- Lorentz force law

- equivalent circuits
- ammeters and voltmeters
- RC circuits and time constants

- EMF devices (batteries)
- Kirchhoff voltage / current laws
- internal resistance of batteries and power of unideal batteries
- resistors in series and parallel

- electric power in circuits
- review for midterm 2

- resistance and resistivity
- calculating resistance from resistivity and geometry

- electric current
- Kirchhoff current law
- current as the flux of current density

- capacitors in parallel and series
- simplifying networks of capacitors
- energy stored in a capacitor
- dielectric material

- capacitors and definition of capacitance
- parallel plate capacitors
- charging a capacitor
- calculating capacitance for various geometries

- electric potential due to a line of charge
- electric potential due to a charged disk
- calculating electric field from electric potential
- potential energy of a system of charges
- electric potential in a conductor

- electric potential difference and independence of path
- electric potential due to many charges

- electric potential difference and independence of path
- electric potential due to many charges

- electric potential
- examples with electric potential

- Gauss' law and conductors
- Gauss' law, lines of charge, sheets of charge

- Gauss' law
- examples including Gauss' law
- deriving Gauss' law from Coulomb's law

- notion of flux (analogy with air flow and windows)
- electric flux
- surface integral for electric flux

- using calculus to calculate electric field
- electric field due to a ring of charge
- electric field due to a disk of charge
- torque and potential energy of electric dipole in a uniform electric field

- electric dipoles and electric dipole moment vector
- electric field due to continuous charge distributions
- example: calculating electric field due to a line of charge

- electric field
- electric field lines
- dipoles

- review of Coulomb's law
- examples with Coulomb's law
- quantization of electric charge
- conservation of electric charge

- electric charge
- properties of electrically charged materials
- Coulomb's law for electrostatic force
- principle of superposition, shell theorem for electric force

- escape speed
- Kepler's three laws of planetary motion and relation to Newton's law of universal gravitation
- satellites, orbits, and energy

- gravitation inside the Earth
- gravitational potential energy
- gravitational potential

- Introduction to course
- Newton's law of universal gravitation
- Principle of superposition
- Newton's shell theorem
- gravitation near Earth's surface
- gravitational field

Professor Jonathan P. Dowling's PHYS 2113 (Section 2) Powerpoint lectures

*Last modified: November 28, 2014.*