Lect_18_note

Lect_18_note - Chapter 30 -2 Sources of the Magnetic Field...

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Chapter 30 -2 Sources of the Magnetic Field
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Gauss’ Law in Magnetism 0 d = BA ± Closed surface
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Ampere’s Law ± Ampere’s law states that the line integral of B . d s around any closed path equals µ o I where I is the total steady current passing through any surface bounded by the closed path. s I o ⋅= B ±
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Stack of magnetic dipoles JAVA
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Solenoid – stack of magnetic dipoles ± A solenoid is a long wire wound in the form of a helix ± Demo – 38
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± The field lines in the interior are approximately parallel to each other and uniformly distributed ± A uniform magnetic field in the space surrounded by the turns of the wire Magnetic Field of a Solenoid
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Wound Solenoid
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Solenoid ± Applying Ampere’s Law gives ± The total current through the rectangular path equals the current through each turn multiplied by the number of turns l B ds B d d 1 path 1 path = ∫∫ = = s B s B NI B d o µ = = l s B
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Magnetic Field of a Solenoid ±
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Lect_18_note - Chapter 30 -2 Sources of the Magnetic Field...

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