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Chapter 9 Magnetic Fields:II. Ampere ’ s Circuital Law Example:Long Cylindrical Conductor Example:Toroidal Coil Example:Refraction of Lines of B at a Current Sheet Short Solenoid The Curl of B. In many cases the same current crosses the surface bounded by the curve C several times. - PowerPoint PPT Presentation
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Chapter 9 Magnetic Fields:II
Ampere’s Circuital Law Example:Long Cylindrical Conductor Example:Toroidal Coil Example:Refraction of Lines of B at
a Current Sheet Short Solenoid The Curl of B
In many cases the same current crosses the surface bounded by the curve C several times. See Fig. 9-2(b) for a solenoid.Then the total current is I×N.
Example: Long Solonoid (see Figs. 9-6 and 9-7 ）
It is very long so that the end effects will negligible.Choose a cylindrical coordinates.
Example: Refraction of Lines of B at a
Current SheetA thin conducting sheet carries a current density α(ampere / meter). (See Fig.9-8)
Example: Short SolonoidSee Fig. 9-9The solonoid has a length l and radius a.
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