907_Physics ProblemsTechnical Physics

907_Physics ProblemsTechnical Physics - Chapter 32 V = Leq...

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Chapter 32 247 (d) VL dI dt RI L dI dt RI L dI dt =+ eq eq 1 1 11 2 2 22 where II I 12 and dI dt dI dt dI dt . We may choose to keep the currents constant in time. Then, 1 RR R eq . We may choose to make the current swing through 0. Then, 1 LL L eq . This equivalent coil with resistance will be equivalent to the pair of real inductors for all other currents as well. Section 32.3 Energy in a Magnetic Field P32.29 L N I B == × = Φ 200 3 70 10 175 42 3 4 . . . ej mH so UL I = 1 2 1 2 0423 00648 2 2 .. . H A J a fa f . P32.30 (a) The magnetic energy density is given by µ ×⋅ B 2 0 2 6 6 2 450 2 1 26 10 806 10 . . . T TmA Jm 3 af . (b) The magnetic energy stored in the field equals u times the volume of the solenoid (the volume in which B is non-zero). Uu V × = 8 06 10 0 260 0 031 0 6 32 6 2 . . m m k J 3 a f bg π P32.31 L NA × L N M O Q P = µµ 0 2 0 2 2 2 68 0 0 600 10 00800 821 A . . H I × = 1 2 1 2 8 21 10 0 770 2 44 26 2 . A J P32.32
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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