Free AP Physics C Help

Videos for AP Physics Help by Topic.

These videos cover the Electricity and Magnetism Curriculum for AP Physics C which is calculus-based physics or introductory college physics.

On the first page of this site is the topic index for the videos.

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At the end of most of the units you will find a set of 3 or 4 review videos for that unit. In these review videos I ask a series of quick questions that are followed by the correct response for each. Once you hear each question pause the video and try to answer it on your own.

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electrostatics | Gauss's Law | potential difference | capacitance | dc circuits |

RC Circuits |
magnetic force on a moving charge | Sources of magnetic fields | eletromagnetic induction | inductance |

AP Physics Help by Topic

I. Electric Charge, Electric Force, and Electric Field

video I1: Types of Charge, Polarization of Charge, and Charging by Induction

video I2: Coulomb's Law, The Principle of Superposition, and Electric Fields

video 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 Lines

video I4: The Motion of Particles in a Uniform Electric Field

video I5: The Electric Field Due to 2 or More Charges

video I6: The Electric Field Due to a Straight Uniformly Charged Wire

video I7: The Electric Field Due to a Straight Uniformly Charged Wire (part 2)

video I8: Electric Field Due to a Ring of Charge

video 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)

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J. 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 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.

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)

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K. Electric Potential

video K1: The electric potential energy of a system of 2 charges

video K2: Potential, Potential Difference, and Voltage

video K3: Potential Difference as a Path Integral

video 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 Plate

video 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 K9: Review for Unit K (part 2)

video K10: Review for Unit K (part 3)

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L. Capacitance and Dielectrics

video L1: The Basics of Capacitance

video L2: The Basics of Capacitance (part 2)

video L3: Energy Stored in a Capacitor

video L4: Pulling the Plates of a Capacitor Apart When the Capacitor is Either Hooked Up to a Battery or Disconnected From a Battery

video L5: Capacitors Hooked Up in Series

video L6: Capacitors Hooked Up in Parallel

video 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)

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M. Direct Current Circuits

video M1: Current, Drift Velocity, and Current Density

video M2: Resistivity, Resistance, and Conductivity

video M3: Resistance

video M4: Finding the External Resistor that will Yield the Maximum Power For a Battery with Internal Resistance

video M5: Bridge Circuits

video 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)

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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)

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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).

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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

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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)