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Unformatted text preview: S is initially open. Find the current I through the battery (a) while the switch is open, (b) immediately after the switch has been closed, (c) a very long time later. Ω 7H Ω 6 Ω 2 3 12V Ι S (a) I = 12V 2Ω + 3Ω + 6Ω = 1 . 09A . (b) I = 12V 2Ω + 3Ω + 6Ω = 1 . 09A . (c) I = 12V 2Ω + 3Ω = 2 . 4A . tsl357 – p.3/4 Intermediate Exam III: Problem #4 (Spring ’06) Consider the circuit shown. The ac voltage supplied is E = E max cos( ωt ) with E max = 170 V and ω = 377 rad/s. (a) What is the maximum value I max of the current? (b) What is the emf E at t = 0 . 02 s? (c) What is the current I at t = 0 . 02 s? ~ L = 30mH (a) I max = E max X L = E max ωL = 170V 11 . 3Ω = 15 . 0A . (b) E = E max cos(7 . 54rad) = (170V)(0 . 309) = 52 . 5V . (c) I = I max cos(7 . 54radπ/ 2) = (15 . 0A)(0 . 951) = 14 . 3A . tsl358 – p.4/4...
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 Spring '07
 AndrevanTonder
 Current, Magnetic Field, Intermediate Exam, Emax Emax

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