Electromagnetic Induction - ASKnLearn

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Dunman High School (Senior High Physics Department)Concept MapBasics of ElectromagnetismMagnetic FieldMagnetic Flux DensityMagnetic FluxMagnetic Flux LinkageBΦ = B. ddNΦVaryB-fieldChangingAreaVarying Magnetic Flux LinkageVary no. ofturns NRotating(Change θ)Induces an electromotive force (e.m.f.) εε = − d(NNNNNNθ)ddLenz’s LawFaraday’s LawMicrophonesInductionChargerSeismographand moreApplicationsTransmissionof ElectricityInductionStoveElectric Guitar9646 Physics (2012)Topic 16: Electromagnetic Induction 16-18
EMI TutorialDunman High School (Senior High Physics Department)Self- Attempt QuestionsS1 A square coil of wire with side 5.00 cm contains 100loops and is positioned perpendicular to a uniformmagnetic field of 0.600 T. It is quickly pulled from thefield at constant speed (moving perpendicular to themagnetic field) to a region of zero magnetic flux density.At t = 0, the right edge of the coil is at the edge of themagnetic field. It takes 0.100 s for the whole coil toreach the field-free region. The coil’s total resistance is100 Ω. Find(a) the change in magnetic flux through the coil(b) the current induced(c) the e.m.f. induced(d) the energy dissipated in the coil(e) F ext required to pull the coil[-0.15 Wb, 15 mA, 1.5 V, 0.00225 J, 0.045N]S2A magnetic field is applied perpendicular to the plane of a flat coil of copper wire. The timevariation of the magnetic flux density is as shown graphically below.At which of the following values of t is the magnitude of the emf induced in the coil amaximum?AT8BT4C3T8DT2(N87/I/20)S3The graph shows the magnetic flux through acoil as a function of time. What is the inducede.m.f. in the coil at (a) t = 0.05 s, (b) t = 0.15 s,(c) t = 0.5 s?[-0.1 kV, 0, 0.04 kV]9646 Physics (2012)Topic 16: Electromagnetic Induction 16-19
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