P31_045 - i = 0 . 9990 E /R , we solve for t: . 9990 E R =...

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45. Starting with zero current at t = 0 (the moment the switch is closed) the current in the circuit increases according to i = E R ³ 1 e t/τ L ´ , where τ L = L/R is the inductive time constant and E is the battery emf. To calculate the time at which
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Unformatted text preview: i = 0 . 9990 E /R , we solve for t: . 9990 E R = E R 1 e t/ L = ln(0 . 0010) = ( t/ ) = t = 6 . 91 L ....
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