Inductance and LR circuits

# Inductance and LR circuits - Electromagnetism Lecture 07...

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Electromagnetism Lecture 07: Inductance and LR Circuits (Knight: 33.8-33.10) x x x x x x x x x x x x x x x x x x v F B q → → → → → → → → → → v F B q × ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ v F = 0 B q B v q E q F × + =

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Physics 113 Dr. Renat Letfullin 2 Inductance Potential Across an Inductor Inductors and Sparks Energy in Inductors and Magnetic Fields The LR Circuit Today.. .
Physics 113 Dr. Renat Letfullin 3 Inductance We define the inductance L of a coil of wire producing flux Φ m as: m L I Φ The unit of inductance is the henry : 1 henry = 1 H = 1 T m 2 /A = 1 Wb/A The circuit diagram symbol used to represent inductance is: Example: The inductance of a long solenoid with N turns of cross sectional area A and length l is: 0 NI B l μ = per turn BA Φ = 2 0 per turn m N A N NBA I l μ Φ = Φ = = 2 0 solenoid m N A L I l μ Φ = =

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Physics 113 Dr. Renat Letfullin 4 Activity : Length of an Inductor 2 2 2 2 5 0 0 0 2 ( / ) ( ) 1.0 10 H N A l d r r l L l l d μ μ π μ π - = = = = × 2 4 2 5
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