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.grande:maestro.

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213) Si veda la figura, T sta per il tasto. Vab=220V, R=14ohm, R1=10ohm, R2=20ohm, C1=10uF, C2=20uF, trovare Itot, Q1, Q2 (su C1 e C2) se il tasto è aperto e se il tasto è chiuso.


[Tasto aperto: I=5A, Qtot=Q1=Q2=1mC; Tasto chiuso: I=5A, .....]

10-06-2009 21:49
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214)Si veda la figura. Il triangolo è in un campo costante E=2,6N/C. BC=3m.
Quanto vale la differenza di potenziale Va-Vc.

Si sfrutti il concetto di lavoro.



[7,8V]

10-06-2009 21:52
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215)Un elettrone fermo viene accelerato da un E=10^6N/C e subisce uno spostamento di 50cm. Qual è la velocità dell'elettrone alla fine dello spostamento?

10-06-2009 21:54
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216) Si veda la figura. Trovare V nel centro del triangolo equilatero di lato l se in ogni vertice c'è una carica q.

10-06-2009 21:55
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217) Ai capi di 3 condensatori in serie c'è una deltaV=100V. La Ceq del sistema vale 100pF, Se V1=50V, V2=20V, quanto valgono C1, C2, C3?




[C1=200pF, C2=500pF, C3=333pF]

10-06-2009 21:57
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*continuo domattina perchè esco* :D

10-06-2009 21:58
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218) Due condensatori C1 e C2 sono in serie e le DeltaV ai loro capi sono V1=30V e V2=20V.
Proviamo a collegare un C3=2uF in parallelo a C1, avremo così V3=V1=5V e V2=45V.
Quanto valgono C1 e C2?



[C1=0,16uF; C2=0,24uF]

11-06-2009 08:19
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219) Un condensatore piano è formato da due dischi metallici di raggio=40cm e distanti 1mm tra loro. Trovare la deltaV da applicar ai dischi affinchè su ciascuno si accumuli una q=1uC in modulo.


[225V]

11-06-2009 08:21
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220) Un condensatore piano C=0,20uF viene collegato ad un generatore di 12V. Trovare l'energia che il generatore deve erogare per caricare il C. Se raddoppiassimo la distanza tra le armature del C, quanta energia dovrebbe erogare? Oppure la riceve?



[U=14,4uJ; U=7,2uJ, la riceve]

11-06-2009 08:23
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221) Un foglio L di alluminio molto sottile viene posto a metà tra le armature di un condensatore piano carico. Quale effetto ha il foglio sulla Capacità se è isolato? Se è collegato con l'armatura?


[...]

11-06-2009 08:24
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222) Una lampada dovrebbe esser alimentata da 40V ed avere R=8ohm. Ma noi disponiamo di 220V come alimentazione. Come possiamo fare per far funzionare corretamente la lampada?

11-06-2009 08:25
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223) Si veda la figura. Se R1=10ohm, calcolare la R2 affinchè i1=12/100


[R2=circa 1milliohm]

11-06-2009 08:27
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224) Data la figura, si risulva con Kirchoff, sapendo che V1=500V, V2=500V, R1=2Kohm, R2=8Kohm, R3=10Kohm.



[i1=-14,6mA; i2=2,6mA]

11-06-2009 08:29
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225) Data la figura, si risolva con Kirchoff, sapendo che V1=100V, V2=50V, V3=80V, R1=10ohm, R2=30ohm, R3=20ohm.



[i2=0,27A; i3=6,08A; i1=5,81A

11-06-2009 08:31
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226) Data la figura, si risolva con Kirchoff, sapendo che V1=10V, V3=15V, R1=50ohm, R4=20ohm, R3=10ohm.




[i1=0,2A; i3=-0,5A; i4=0,5A; i2=0A; i=0,2A]

11-06-2009 08:33
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