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QCM 14 poly avant


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C. (VRAI) Dire que l'aimantation longitudinale est égale à M0 revient à dire que l'angle φ = 180° soit π rad. on applique la formule φ =ω1Δt avec ω1=γB1. Ce qui donne : (26,75x10^7 ) x (3x10-4 ) x (3,91x10-5 ) = 313,78x10-2 rad = 3,14 rad = π rad = 180°. En faisant 27*3*4*10-2 vous tombiez sur 3,24 et on se doute que c'est proche de π donc de 180°...

 

Comment on sait que γ = 26,75 x 10⁷ ? 

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