Magnatic lecture

magnatic lacturesMagnetic FieldsMagnetic Field LinesThe magnitude and direction of FB depend on the velocity and on the magnitude and direction of the magnetic fieldMagnetic Fields due to CurrentsWhen a charged particle moves parallel to the magnetic field vector, the magnetic force acting on the particle is zeroExperimentsThe magnitude and direction of FB depend on the velocity of the particle and on the magnitude and direction of the magnetic field B.the IS unit of manatic field is Tesla (T)magnetic field is vector quantityInduction and Inductancethe direction of the tangent to a magnetic field line at any point gives the direction of B at that point .the spacing of the lines represents the magnitude of B the magnetic field is stronger where the lines are closer together.experimental observations:The vector dB is perpendicular to ds and to unit vector directed from ds toward P.The magnitude of dB is inversely proportional to r2The magnitude of dB is proportional to the current and to the magnitude ds of the length element ds.The magnitude of dB is proportional to sinBiot–Savart law:Faraday’s law of InductionAn emf is induced in a loop each time the magnetic field changesThe law states that an emf is induced in the loop each time the number of magnetic field lines that pass through it changes.Magnetic FluxLenz’s LawThis law is used to find the direction of the induced current:the direction of the induced emf is the same as the direction of the induced current.Inductors and InductanceSubtopicRL CircuitsAlternating Current1- Resistive Load2- Capacitive Load3- Inductive LoadXR= RiLand vL are 90° out of phase.The Series RLC CircuitTransformers
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