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Intensité du champ magnétique (H) au centre d’un cran circulaire
Matériel didactique : Tableau Noir et craie blanche
Objectif opérationnel : A l’issue de la leçon, l’élève sera capable d’écrire la relation du champ magnétique et calculer l’intensité du champ magnétique

Rappel

De quoi dépend le coefficient μ, d’une induction magnétique?

Rappel

Le coefficient μ de l’induction magnétique dépend de :

  • Du milieu dans lequel se trouve l’induction.
  • Des unités choisies.

Motivation

Quelle est la grandeur physique qui a comme unité l’ampère ?

Motivation

L’ampère est l’unité de l’intensité électrique.

Annonce du sujet

Qu'allons-nous étudier aujourd'hui?

Annonce du sujet


Aujourd'hui, nous allons étudier l'Intensité du champ magnétique (H) au centre d’un cran circulaire.

Analyse

Qu'est-ce que l'intensité du champ magnétique?

Analyse

L’intensité du champ magnétique au centre d’un cran circulaire.

L’intensité au champ désignée par H, est donnée par la révélation : H=I / (2*R)

Avec ; l’intensité du courant en A, R rayon de la spire en m et H li*’intensité du champ an A/m.

Ex : calculez l’intensité du champ magnétique au centre d’un courant de 6A et de 8cm de rayon.

Ex : calculez l’intensité du champ magnétique au centre d’un courant de 6A et de 8cm de rayon.

N.B pour une bobine plate : H=(N*I) / (2*R)

N : nombre spire.

Comment calculer le champ magnétique crée au centre de la bobine ?

Ex : une bobine plate mesure 10cm de diamètre et comporte 200spires. Si le courant qui y circule est de 02,25A, le champ magnétique crée au centre de la bobine vaux : 1)50A/m, 2)0500A/m, 3)5000A/m, 4)250A/m 5)150a/m

MessagesTimelineExceptionsViews7RouteQueries40Models54GateSessionRequest
8.1.28PHP Version165msRequest Duration6MBMemory UsageGET lessons/{id}/{slug}Route
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