Lecture 22 - Moving charges as sources of magnetic field

Lecture 22 - Moving charges as sources of magnetic field -...

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1 Lecture 22 Moving charges as sources of Moving charges as sources of magnetic field. What produces magnetic fields? By symmetry, it is reasonable to think that B fields are also produced by moving charges A moving charge experiences a force in a -field moving charge 1 generates -field and exerts a force on moving charge 2 generates -field and exerts a force on Magnetic field by a moving charge: experimental facts •W h e n q larger, and when v larger, larger -field produced -field decreases with 1/distance 2 from the moving source -field is NOT directed away or towards moving charge 2 1 r charge ( q > 0) moving into screen -field line is circular around moving charge Magnetic field by a moving charge: equation -field at point P 0 2 ˆ ˆ unit vector from charge to P 4 vr Bq μ π × == G G 7 0 permeability constant 4 10 T m/A μπ If 0 then ˆ B same direction as > × G G
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2 B field by a current Strategy a) consider small length of wire dl b) calculate -field from this small segment ( dB )
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Lecture 22 - Moving charges as sources of magnetic field -...

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