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problem30_21

problem30_21 - 30.21 a i = R(1 e-t = L R-t-t = imax = R so...

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Unformatted text preview: 30.21: a) i = / R (1 - e -t / ), = L / R -t / -t / = imax = / R so i = imax / 2 when (1 - e ) = 1 , and e 2 - t / = ln ( 1 ) and t = 2 1 2 L ln2 (ln 2) (1.25 10 -3 H) = = 17.3 s R 50.0 2 2 b) U = 1 Li ; U max = 1 Li max 2 2 U = 1 U max when i = i max / 2 2 1 - e -t / = 1 2 so e -t / = 1 - 1/ 2 = 0.2929 t = - L ln(0.2929)/ R = 30.7 s ...
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