Physics > Lab Report > Lab Report for PHYSICS 2021/2031 Lab 9-Electromagnetic Induction-REVIEWED BY EXPERTS 2021 (All)

Lab Report for PHYSICS 2021/2031 Lab 9-Electromagnetic Induction-REVIEWED BY EXPERTS 2021

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Electromagnetic Induction 1. Objective The aim of this experiment is to learn how a permanent magnet, a moving coil with a constant current, and a constant coil with a changing current, change the ... induced voltage in a coil. 2. Description The apparatus used in this lab includes Capstone, RLC circuit board, box with 2 coils that has iron rod and a cylindrical magnet, 1 voltage sensors, 2 leads (120 cm.), and 1 lead (150-200 cm). In this experiment an emf was induced in one coil by moving a permanent magnet into and out of the coil, moving a second coil, which has a current, near the first coil, and changing the current in the second coil. Most of the results were be qualitative. The strength of the induced emf depends on the rate of change of the magnetic field. When an emf is induced in a coil the current that results will depend on the resistance of the circuit which the coil is part of. A voltage will also appear across the coil which was measured by a voltmeter. 3. Theory The changing magnetic field produces an electric field which is not conservative. The line integral of the electric field around a loop or circuit is not zero and is called an electromotive force or EMF. The EMF can drive a current in a circuit. The unit of EMF is the volt (V). The flux Φ of the magnetic field is defined in a similar way to the flux of the electric field. A magnetic field vector ⃗ B passes through a differential area d ⃗A . The differential element of magnetic flux associated with d ⃗A is dΦ = ⃗ B · d ⃗A . It is only the component of ⃗ B that is perpendicular to the surface area that contributes to the flux. For a finite area the magnetic flux is Φ = ∫⃗ B · d ⃗A . The line integral of the electric field around the boundary of the area is called EMF (voltage). The positive directions of d ⃗A and the line integral must be consistent with the right hand rule where the thumb points in the direction of d ⃗A . [Show More]

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