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Date: 19-12-2020
1676
Date: 2-1-2017
2015
Date: 16-10-2020
1404
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Calculation of ienclosed
From Figure (1) we see that we get a current i up through our path each time another turn comes up through the path. On the left side of the coil the current goes down into the paper, but these downward currents lie outside our path and therefore are not included in our evaluation of ienclosed. Only the positive upward currents count, and ienclosed is simply i times the number of turns that go up through the path.
To calculate the number of turns in a height h of the coil, we note that if the coil has a length L and a total of N turns, then the number of turns per unit length n is given by
and in a height h there must be nh turns
With nh turns, each carrying a current i, going up through our path, we see that ienclosed must be
ienclosed = inh
Figure 1: Right hand rule for using Ampere's law. We define the positive direction around the path as the direction you curl the fingers of your right hand when the thumb is pointing in the direction of the current through the path. (As you see, we can come up with a right hand rule for almost anything.)
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إجراء أول اختبار لدواء "ثوري" يتصدى لعدة أنواع من السرطان
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دراسة تكشف "سببا غريبا" يعيق نمو الطيور
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لأعضاء مدوّنة الكفيل السيد الصافي يؤكّد على تفعيل القصة والرواية المجسّدة للمبادئ الإسلامية والموجدة لحلول المشاكل المجتمعية
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قسم الشؤون الفكرية يناقش سبل تعزيز التعاون المشترك مع المؤسّسات الأكاديمية في نيجيريا
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ضمن برنامج عُرفاء المنصّة قسم التطوير يقيم ورشة في (فنّ الٕالقاء) لمنتسبي العتبة العباسية
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وفد نيجيري يُشيد بمشروع المجمع العلمي لحفظ القرآن الكريم
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