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QCM 23 item D et E poly Pr. GANTET


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Posted (edited)

Salut @PH₂ !

 

Ici, quand le prof dit "l'aimantation longitudinale a atteint XX% de l'aimantation résultante d'équilibre", cela se traduit mathématiquement avec Mz = l'aimantation longitudinale et M0 = l'aimantation résultante d'équilibre par Mz/M0. Il te suffit donc de calculer ce rapport en utilisant cette formule image.png.17d086e9e5347112c73a52c946b45176.png

et en posant t=140ms et T1=700ms

Soit Mz/M0 = 1 - e^(-140/700) = 1- e^(-0,2) = 1 - 0,82 = 0,18 = 18%

 

Est-ce que c'est bon pour toi ?

Edited by Camcammm

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