Phys 202 1nd Edition Lecture 20Outline of Last Lecture I. Circuits with multiple resistors and/or multiple capacitorsOutline of Current Lecture II. Review of Conceptsa. Coulombs Lawb. Biot Savart Lawc. EMFCurrent LectureReview of Concepts:Coulombs law:Coulombs law describes the electrostatic interaction between electrically charged particles. This law is essential to the development of the theory of electromagnetism. Coulomb's law states:“The magnitude of the electrostatic force of interaction between two point charges is directly proportional to the scalar multiplication of the magnitudes of charges and inversely proportional to the square of the distance between them. The force is along the straight line joining them. If the two chargeshave the same sign, the electrostatic force between them is repulsive; if they have different sign, the force between them is attractive.”Equationally, Coulombs law can be described as;F=14 πEq 1 q 2r2 = Ε ⋅dA=qencEBiot Savart Law:The Biot-Savart Law relates a magnetic field to the current that it comes from in a similar way that Coulombs law relates an electric field to the point charge that it comes from. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Consider an electric wire with a length L carrying a current I. A magnetic field of magnitude B emanates from this wire out to a distance r from the wire. The equation for the magnitude of the magnetic field around this wire is;dB=μ4 πidl ⨂ rr3 ∮B⋅ dl=μ IencEMF:Emf is the electromotive force and, according to Faridays law of induction, is equal to the change in the magnetic flux over the change in time. The direction of the emf is given by Lenz’s law, which states that the induced current will flow in the opposite direction of the change in flux that produced it.EMF(ϵ)=∮E ⋅ dl=−d
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