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# Electricity and Magnetism AP Physics Help by TopicI. Electric Charge, Electric Force, and Electric Fieldvideo I1: Types of Charge, Polarization of Charge, and Charging by Inductionvideo I2: Coulomb's Law, The Principle of Superposition, and Electric Fieldsvideo I3: Force due to an Electric Field on a Point Charge, Torque due to an Electric Field on a Set of Charges, Information from Electric Field Linesvideo I4: The Motion of Particles in a Uniform Electric Fieldvideo I5: The Electric Field Due to 2 or More Chargesvideo I6: The Electric Field Due to a Straight Uniformly Charged Wirevideo I7: The Electric Field Due to a Straight Uniformly Charged Wire (part 2)video I8: Electric Field Due to a Ring of Chargevideo I9: Electric Field Due to a Semi-Circular Ring of Charge video I10: Unit I Review of Electrostatics (part 1).  You might want to pause the video each time a question is asked and try to get the answer on your own.video I11: Unit I Review of Electrostatics (part 2)video I12: Unit I Review of Electrostatics (part 3)J.   Gauss's Law

video J1: An Introduction to Gauss's Law.  This video explains the basics behind Gauss's Law.

video J intro 1: An Introduction to Electric Flux (part 1)

video J intro 2: An Introduction to Electric Flux (part 2)

video J3: Finding the Electric Field for a Uniormly Charged Solid Wooden Sphere.  It doesn't have to be made out of wood.  It can be any insulating material.

video J4:  Conductors in Electrostatic Equilibrium
video J5: Gauss's Law and Concentric Spherical Shells
video J6: Gauss's Law and Concentric Spherical Shells (part 2)
video J7: Gauss's Law and Co-Axial Cables
video J8: Gauss's Law and Co-Axial Cables (part 2)
video J9: Gauss's Law and the Electric Field Due to a Very Long and Wide Slab of Charge.
video J10: Gauss's Law and the Electric Field Due to a Very Long and Wide Plane of Charge.
video J11: Gauss's Law and a the Electric Field Due to a Non-Uniformly Distributed Spherical Charge Density
video J12: Gauss's Law and the Electric Field Due to a Non-Uniformly... (part 2)
video J13: Gauss's Law and the Electric Field Due to a Non-Uniformly Charged Cylindrical Insulator.
video J14: Gauss's Law and the Electric Field Due to a Non-Uniformly Charged Cylindrical Insulator (part 2)

video J2: Gauss's Law (part 2).  This video explains how to use Gauss's law to find the electric field due a very long uniformly charged wire.

# K.   Electric Potentialvideo K1: The electric potential energy of a system of 2 chargesvideo K2: Potential, Potential Difference, and Voltagevideo K3: Potential Difference as a Path Integralvideo K4: Potential Difference as a Path Integral (part 2)video K5: Accelerating a Positive Charge, Q, From a Positively Charged Plate to a Negatively Charged Platevideo K6: Conductors in Electrostatic Equilibrium (Revisited)video K7: Conductors in Electrostatic Equilibrium (Revisited... part 2)video K8: Review for Unit K (part 1)  You might want to pause the video each time a question is asked and try to get the answer on your own.

video K10: Review for Unit K (part 3)

# video K9: Review for Unit K (part 2)L.  Capacitance and Dielectricsvideo L1: The Basics of Capacitancevideo L2: The Basics of Capacitance (part 2)video L3: Energy Stored in a Capacitorvideo L4: Pulling the Plates of a Capacitor Apart When the Capacitor is Either Hooked Up to a Battery or Disconnected From a Batteryvideo L5: Capacitors Hooked Up in Seriesvideo L6: Capacitors Hooked Up in Parallelvideo L7: Review of Unit L. Capacitance.  You might want to pause the video each time a question is asked and try to get the answer on your own.video L8: Review Unit L. Capacitance (part 2).video L9: Review Unit L. Capacitance (part 3)video L10: Review Unit L. Capacitance (part 4)M. Direct Current Circuitsvideo M1: Current, Drift Velocity, and Current Densityvideo M2: Resistivity, Resistance, and Conductivityvideo M3: Resistancevideo M4: Finding the External Resistor that will Yield the Maximum Power For a Battery with Internal Resistancevideo M5: Bridge Circuitsvideo M6: Review for Unit M. DC Circuits. You might want to pause the video each time a question is asked and try to get the answer on your own.video M7: Review for Unit M. DC Circuits (part 2)

video M8: Review for Unit M. DC Circuits (part 3)
video M9: Review for Unit M. DC Circuits (part 4)

N.   Decay and Growth in Physics  (RC Circuits)*

video N1: RC circuits - Getting a Conceptual Grasp for RC Circuits
video N2: Discharging a Capacitor in an RC Circuit (The Mathematics)
video N3: Charging a Capacitor in an RC Circuit (The Mathematics)
video N4: Time Constants for RC Circuits
video N5: Review of Unit N (part 2)  If you are wondering where part 1 is, this unit is both air resistance and RC circuits so part 1 in the air resistance unit in mechanics.  There is a little air-resistance physics at the beginning of this one as well.  You might want to pause the video each time a question is asked and try to get the answer on your own.
video N6: Review of Unit N (part 2)

O.

Magnetic Fields

video O1: Force on a Charged Particle in a Magnetic Field.  There is a review of the right-hand rule here.
video O2: Force of a Charged Particle in a Magnetic Field (part 2)
video O3: Force on a Charged Particle in a Magnetic Field (part 3)
video O4: Charged Particle Moving in a Straight-Line Through Both and Electric Field, E, and a Magnetic Field, B.
video O5: Force on a Current-Carrying Wire in a Magnetic Field.  This video also includes the torque on a current-carrying loop positioned in a magnetic field.
video O6: Unit O Review (part 1). You might want to pause the video each time a question is asked and try to get the answer on your own.
video O7:  Unit O Review (part 2).
video O8:  Unit O Review (part 3).
video 09: Unit O Review (part 4).

P.    Sources of Magnetic Fields

video P1:  The Direction of the Magentic Field Created by a Current-Carrying Wire and the Direction of the Magnetic Field Created by a Moving Charge
video P2:  Calculating the Magnetic Field Strength Created by a Moving Charge
video P3:  The Law of Biot-Savart or Calculating the Magnetic Field Strength due to an Infinitesimally Small Current-Carrying Segment of Wire.
video P4: An Application of the Law of Biot-Savart
video P5:  An Introduction to Ampere's Law (part 1).  Uses an understanding of Gauss's law to introduce Ampere's law.
video P6:  An Introduction to Ampere's Law (part 2).  Finishes the derivation of the equation that gives you the magnetic field strength a distance r away from a current carrying wire.
video P7:  Applications of Ampere's Law (part 1).  Applies Ampere's law to find the magnetic field strength inside of a wire that has a uniform current density.
video P8:  Applications of Ampere's Law (part 2).  Applies Ampere's law to a co-axial cable.
video P9:  Applications of Ampere's Law (part 3).  Applies Ampere's law to find the magnetic field strength inside a wire that has a non-uniform current density.
video P10: The Magnetic Field Near the Center of a Solenoid (part 1).  Applies Ampere's law to find the equation for the magnetic field strength near the center of a current-carrying solenoid.
video P11: The Magnetic Field Near the Center of a Solenoid (part 2).
video P12: The Magnetic Field Due to Two Wires (Superposition of Magnetic Field Vectors)
video P13:  Force of One Current-Carrying Wire on Another Current-Carrying Wire
video P14:  The Magnetic Field Due to a Toroid
video P15:  The Magnetic Field on the Axis of a Current-Carrying Circular Hoop
video P16:  p. 1 Unit P Review: Sources of Magnetic Fields.  You might want to pause the video each time a question is asked and try to get the answer on your own.
video P17: p. 2 Unit P Review: Sources of Magnetic Fields

Q.   Electromagnetic Induction

video Q1: Magnetic Flux (part 1)  To understand electromagnetic induction you will need to understand magnetic flux.  This video describes the flux due to three different types of fields... gravitational fields, electric fields, and magnetic fields.

video Q2: Magnetic Flux (part 2)

video Q3: Calculating the Magnetic Flux for a Non-Uniform Magnetic Field

video Q4: Faraday's Law Basics (part 1)

video Q5: Faraday's Law Basics (part 2)

video Q6: Faraday's Law Basics (part 3)

video Q7: Lenz's Law: Finding the Direction of Induced Current (part1)

video Q8: Lenz's Law (part 2)

video Q9: Lenz's Law (part 3)
video Q10: Motional EMF .  This video explains how Faraday's law is applied to a conducting bar that slides along a conducting rail to complete a loop.
video Q11: The Generator.  This video explains how Faradays's law is applied to a conducting loop that is rotated in a magnetic field to produce a voltage and a current.
video Q12: Faraday's Law and Induced Electric Fields. (part 1)
video Q13: Faraday's Law and Induced Electric Fields (part 2)
video Q14: Unit Q Review on Electromagnetic Induction (part 1 of 4)
video Q15: Unit Q Review on Electromagnetic Induction (part 2 of 4)
video Q16: Unit Q Review on Electromagnetic Induction (part 3 of 4)
video Q17:
Unit Q Review on Electromagnetic Induction (part 4 of 4)

R.   Inductance

video R1: Inductance Basics part 1
video R2: Inductance Basics part 2
video R3: Energy Stored in an Inductor
video R4: The RL Circuit part 1
video R5:  The RL Circuit part 2
video R6: Time Constants for RL Circuits
video R7: An Example Inductance Problem
video R8: The LC Circuit (part 1)
video R9: The LC Circuit (part 2)
video R10: Unit R Review for Inductance (part 1)
video R11:  Unit R Review for Inductance (part 2)