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Published byGervase Johnston Modified over 4 years ago

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Ch 32 Inductance 32.1 Self Inductance L = N B /I L = -L(dI/dt) Units: Tm 2 /A = Henry Solenoid P32.4 (p.916) P32.3 (p.916)

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Ch 32 Inductance 32.2 RL Circuits I = (1 – e -t/ )/R = L/R t=0 close I = e -t/ /R t=0 short

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CT1: When the switch is closed, the current through the circuit exponentially approaches a value I=E/R. If we repeat this experiment with an inductor (solenoid) having twice the number of turns per unit length, the time it takes for the current to reach a value of I/2 A. increases. B. decreases. C. is the same.

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Ch 32 Inductance 32.3 Energy Stored in a Magnetic Field U = LI 2 /2 u = U/Volume = B 2 /2 0 P32.25 (p.918)

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Ch 32 Inductance 32.4 Mutual Inductance Read

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Ch 32 Inductance 32.5 Oscillations in an LC Circuit

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Ch 32 Inductance 32.5 Oscillations in an LC Circuit q = A cos(t + ) = (1/LC) 1/2 For q = Q max and i = 0 at t = 0 q = Q max cos(t) I = Q max sin(t) I max = Q max U = Q max 2 /2C = LI max 2 /2

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Fig 32-17, p.1017

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Fig 32-17a, p.1017

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Fig 32-17b, p.1017

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Fig 32-17c, p.1017

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Fig 32-17d, p.1017

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Fig 32-17e, p.1017

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Fig 32-18, p.1018

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Fig 32-19, p.1019

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P32.39 (p.919) P32.43 (p.919)

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