Circuit-slide-13

Circuit-slide-13 - Review: Time Varying Fields In the...

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Review: Time – Varying Fields In the dynamics case, we can distinguish between two regimes: Low Frequency (Slowly-Varying Fields) – The displacement current is negligible in the Maxwell’s equations, since High Frequency (Fast-Varying Fields) – The general set of Maxwell’s equations must be considered, with no approximations.
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In the low frequency regime we use the complete set of Maxwell’s equations, but the displacement current is omitted
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The concept of low frequency and slowly-varying phenomena is relative to the situation at hand. Any disturbance (time-variation) of the electromagnetic field propagates at the speed of light. If a length L is the maximum dimension of the system under study, the maximum propagation time for a disturbance is We can assume slow-varying fields if the currents are practically constant during this time period. For sinusoidal currents , with a period of oscillation T , we have
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The electric potential is now by itself insufficient to completely describe the time-varying
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This note was uploaded on 03/09/2012 for the course ECE 450 taught by Professor E.kudeki during the Spring '12 term at Illinois College.

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Circuit-slide-13 - Review: Time Varying Fields In the...

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