Lect_23_note

# Lect_23_note - Chapter 32-1 Inductance Faradays law B(t d B...

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Chapter 32-1 Inductance

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Faraday’s law B(t) E B d d dt Φ ⋅= Es ±
Lenz’s Law ± Lenz’s law : the induced current in a loop is in the direction that creates a magnetic field ( B induce ) that opposes the change in magnetic flux through the area enclosed by the loop B(t) 0 E B induce

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I t ε /R
Self-Inductance ± This effect is called self-inductance ± Because the changing flux through the circuit and the resultant induced emf arise from the circuit itself ± The emf ε L is called a self-induced emf

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Self-Inductance I t ε /R ( ε+ε L ) /R ( ) /R
Self-Inductance ± A induced emf is always proportional to the time rate of change of the current ± L is a constant of proportionality called the inductance I L d ε L dt =−

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Inductance ± The SI unit of inductance is the henry (H) ± A circuit element that has a large self- inductance is called an inductor A s V 1 H 1 =
Inductance of a Solenoid A closely spaced coil of N turns carrying current I has an inductance of I L d ε L dt =−

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## This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_23_note - Chapter 32-1 Inductance Faradays law B(t d B...

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