Physics II Lab w answers_Part_36 - to zero At this point...

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83 to zero. At this point the material has a residual magnetization and behaves like a permanent magnet. To make the magnetization zero (point d) requires a non-zero current in the reverse direction. As I is increased in the reverse direction, M saturates to a maximum negative value (point e). Further increase in the current brings the magnetization to zero (point g) and eventually to saturation (point b). I.7 Retentivity & Coercivity: Retentivity (M O ) is the residual magnetization in the sample when the external magnetic field is zero . This is calculated as ( ) O E O O Tan B r l r l M ± ² ³ 2 2 2 4 / 2 4 - = ------------------------(6) Where, 2 f c Tan O = (c & f are the points in the graph, fig 4) ---------------(7) Coercivity B O is the external magnetic field required to reduce the residual magnetization in the sample to zero. O O O O I n B ; 2 g d I = = -------------------------------(8) ( d & g are the points in the graph , fig 4 ) II Set-up and procedure: 1. Complete the wiring of the apparatus according to the circuit diagram, fig 5

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Physics II Lab w answers_Part_36 - to zero At this point...

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