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Sources of Mag. Field

# Sources of Mag. Field - PHY 2049C General Physics B Fields...

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: How to create magnetic fields

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Forces due to Magnetic Field: Current A current in a magnetic field feels a force ; Unit for magnetic field; 1 Tesla = 1 T = 1 N A & m sin FI L B L B θ = GG G
F F I I Example: Loudspeaker A coil is located inside a uniform magnetic field of a permanent magnet. Depending on the direction of current in the coil, the Lorentz- force pushes the coil (and the speaker cone) into the magnet or out of the magnet. F IL B GG G

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Torque on a Coil due to Magnetic Field

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Torque on a current loop Force on vertical sides Torque on each side Net torque or F IaB = 11 22 sin sin bF IabB τ θθ = = sin IAB θ = B τμ = × G G G
How to create Magnetic Fields Magnetic Fields are produced by moving charges ( Electric Fields are produced by charges ) ± Moving single charge ± Current in a wire +

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The Magnetic Field of Moving Charges Moving charges feel the B-field => they also create the B-field with μ 0 = 4 π ·10 -7 T·m / A “permeability of free space” The magnetic field direction is perpendicular to both the v and r vectors + B 0 2 4 qv r B r μ π × = GG G
Example: Magnetic Field

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Sources of Mag. Field - PHY 2049C General Physics B Fields...

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