P31_060 - 60(a The energy delivered by the battery is the...

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60. (a) The energy delivered by the battery is the integral of Eq. 28-14 (where we use Eq. 31-43 for the current): Z t 0 P battery dt = Z t 0 E 2 R ³ 1 e Rt/L ´ dt = E 2 R · t + L R ³ e Rt/L 1 ´ ¸ = (10 . 0V) 2 6 . 70 Ω · 2 . 00 s + (5 . 50 H) ( e (6 . 70 Ω)(2 . 00 s) / 5 . 50 H 1 ) 6 . 70 Ω ¸ =1 8 . 7J . (b) The energy stored in the magnetic Feld is given by Eq. 31-51: U B = 1 2 Li 2 ( t )= 1 2 L µ E R 2 (1
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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