Written Homework 14 Solutions

Written Homework 14 Solutions - Physics221Fall2007 4...

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Physics 221 Fall2007 Written Homework due Tuesday, December 4 1-- A bank of 5.0 pF capacitors, connected in parallel, is used to store electric energy. What does it cost to charge the 2000 capacitors of the bank to 50,000 V, assuming a cost of three cents per kW-hr? SToA€D fr-r€tGY lS !C Vt i=*A l\ CAPNc. I T",r\ CoSi- = \J= Looc t$t 5 \\o 2_ t l. Iq"?L Ko\i -q F\[s.tot vl' t-sv lor T ) o-ol $ eosT= o. \c1l $ ry- lo (- 5
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Physics 221 Fall2007 Wriuen Homework due Tuesday, December 4 2-- A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18 MV/m If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of 7 .0 x l0-' FF and to en$rre that the capacitor will be able to withstand a potential difference of 4.0 kV? Nrl \ NC L\P-gef E"- Fre L0 15 tK Yloc vl* {=oR N= tx\o' V Txa Freuo lN l}€ f= fr 0ttl-€c Ta*\c so Th€ i- A- \v \AJILL R€ Sr\&l-uE.sT A t5 a lrtf v t=:rvbL^ AV A a - fjAtAKk*rJ \,J \TF\ KtlowtJ - \cuuc tr.c*- t\rnf: W€<, tr=J' ^ )( I..lck 1_ /hN t{ ii \l I
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This homework help was uploaded on 03/27/2008 for the course PHYS 221 taught by Professor Herrera-siklody during the Fall '08 term at Iowa State.

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Written Homework 14 Solutions - Physics221Fall2007 4...

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