# Physics II Lab w answers_Part_35 - Experiment 13 Hysterisis...

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81 Experiment 13 Hysterisis loop for a ferromagnetic material (M–B curve) Apparatus: Two solenoid coils, S and C, ferromagnetic specimen rod, reversible key (R), ammeter, magnetometer, battery, solenoid, rheostat and transformer for demagnetizing set up. Purpose of experiment: i) To study the magnetization (M) of a ferromagnetic material in the presence of a magnetic field B and to plot the hysterisis (M vs. B) curve . ii) To calculate the retentivity and coercivity of the material. Basic Methodology: A ferromagnetic rod is magnetized by placing it in the magnetic field of a solenoid. The magnetized rod causes a deflection ( ° ) in a magnetometer .The deflection ° is recorded as the current in the solenoid (I) is varied over a range of positive and negative values . I. Introduction: I.1 The magnetic field of a solenoid at a point on its axis is I n B O ° = ----------------------------(1) where ± O = 4 ² x 10 -7 Nm 2 / A 2 is the magnetic permeability of vacuum , n is the number of turns per unit length in the solenoid and I is the current in the solenoid .

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