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22 - Induction

22 - Induction - Physics 212 Electromagnetic Induction Fall...

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Physics 212 Fall 2009 Electromagnetic Induction 10/19/09
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Summary B d s closed loop = μ o i enc Bh = μ o nih B = μ o ni Ampere’s Law Solenoid - Turns of current carrying wire in close-packed coils n = # turns / length i enc = ni current enclosed
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Induction Magnet Steady No Current Push Magnet Create Current Reverse Magnet Motion Reverse Current Coil of Wire (solenoid) is called an inductor Get induced current with changing magnetic “Flux”
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Interacting Coils Since a current carrying coil acts like a magnet, two coils can “interact” the same way Note: This only occurs when 1) the coils are moving relative to each other 2) the current is changing in the circuit Changing Magnetic “Flux”
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Flux Need Two Vectors direction of ±eld direction of surface Φ = v A Field Strength Through a Surface Magnetic Flux Quantify Magnetic Field Lines Through Surface Δ A E Δ A E Electric Flux Φ E = E d A = E cos( θ ) dA
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Magnetic Flux Units: Weber (Wb) Wb=Tm 2
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22 - Induction - Physics 212 Electromagnetic Induction Fall...

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