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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
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”
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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