# Physics II Lab w answers_Part_38 - Calculations 1 Attach...

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87 Calculations: 1. Attach graph of Tan θ vs. I. 2. cf = _____________________ dg = ____________________ 3. Calculation of retentivity M O : Calculation of coercivity B O : Results: Retentivity M O = _______________ Coercivity B O = ________________ (One graph paper required).

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88 Experiment 14 Electromagnetic Induction Apparatus: Metallic semi–circular arc (radius 40 cm), supporting frame, movable weights, bar magnets measurement board consisting of voltmeter, milli – ammeter, resistance condenser and diode. Purpose of experiment: To verify Faraday’ s laws of electromagnetic induction. Basic Methodology: A bar magnet is made to pass through a coil .The resulting emf produced by Faraday’ s effect charges a capacitor .The voltage of the capacitor is a measure of the induced emf . I. Introduction I.1 Faraday’ s law states that a charge in magnetic flux ( ° ) through a closed conducting circuit induces an electro motive force (emf) ° in the circuit . dt d Φ - = ° --------------------------------(1) The emf ° is proportional to the rate of change of the flux through the coil. The
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