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# Lec-17 - Previous Lecture Magnetic field energy density LC...

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Previous Lecture Magnetic field energy density LC oscillations Modified Ampere’s Law October 24, 2007 – p.

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Today Maxwell’s Equations start ac circuits (Phasor diagrams) – p.
Hour Exam Conflicts If you are taking Acct 151, you should take the Phys 21 hour exam at the regular time next Thursday (Nov. 1). If you are taking Engr 001, stay tuned while we sort it out. – p.

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Ampere’s Law – final form I B · d l = µ 0 I + µ 0 ± 0 I E ∂t · d A – p.
Maxwell’s equations I E · d A = Q ± 0 I B · d A =0 I E · d l = I B ∂t · d A I B · d l = µ 0 I + µ 0 ± 0 I E · d A – p.

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ac circuits We will calculate the steady state behavior. The key point is the phase relationships. – p.
Trig Formulas sin( a ± b ) = sin a cos b ± cos a sin b cos( a ± b ) = cos a cos b sin a sin b cos( θ ± π 2 ) = cos θ cos π 2 sin θ sin π 2 = sin θ – p.

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Resistor only – p.
Resistor only The current and voltage are in phase in a resistor.

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Lec-17 - Previous Lecture Magnetic field energy density LC...

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