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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi A - F > Fisica generale > Esercizi Thread Rating: 1 votes, 5.00 average.
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.grande:maestro.

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227) Una linea elettrica di R=o,5ohm eroga una potenza di 10KW a 250V. Quanto vale la Potenza dissipata in calore? E la potenza fornita dalla linea? Il rendimento?


[800W; 10800W; 93%]

11-06-2009 08:34
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Q) ELETTROMAGNETISMO III : CAMPO MAGNETICO

11-06-2009 08:35
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228) Un elettrone entra da sinistra in un B=0,01T entrante nel foglio. L'elettrone ha v=2*10^7m/s e si muove sul piano perpendicolare al campo magnetico. Descrivere la traiettoria dell'elettrone, fornendo ampia spiegazione vettoriale di ciò che accade..



[circolare, r=1,1mm]

11-06-2009 08:47
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229) Si veda la figura. AB=l=0,9m scorre senza attrito sui due conduttori paralleli.
B vale 1T, DeltaV=36V, R=3ohm.
Quanto deve valere F sull'asta perchè il sistema sia in equilibrio dinamico?
Se F è nulla, trovare itot in funzione della v dell'asta e trovare v di regime.


[F=16,2N; .... ; vregime=24,7m/s]

11-06-2009 08:53
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230) Si veda figura. Ve=3*10^5m/s, B=2T. Che F subisce l'elettrone?
Se invece l'elettrone arriva nella regione dentro un condensatore, come devo caricare le armature affinchè l'elettrone non si schianti (poverino...:-( ) contro una delle due armature?

[F=9,6*10^-14N; ....]

11-06-2009 08:56
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231) Un elettrone si muove con v=2*10^7m/s in un piano perpendicolare ad un B=1,2mT. Troare il r dell'orbita dell'elettrone.



[9,5cm]

11-06-2009 08:57
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232) Una bobina quadrata di lato=20cm ha un lato libero di scorrere. La bobina ha R=2ohm ed è immersa in un B=3T perpendicolare. Se il lato mobile scorre con v=4m/s verso l'esterno, quanto vale la i indotta?


[1,2A]

11-06-2009 08:59
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233) Un protone viene lanciato in un B=0,5T con v=300m/s in direzione Theta=30° rispetto al B.
Trovare Florentz vettoriale. Trovare Florentz se viene lanciato un elettrone alle stesse condizioni.

11-06-2009 09:01
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234) In una regione con B=0,2T lungo l'asse y, un E=-300V/m lungo z, si ha un protone che entra lungo x con v=1km/s.
Quanto vale la Florentz agente sul protone? Perchè il protone non venga deviato dal B, quanto deve valere v?



[-1,6*10^-17N lungo.... ? ; 1,5km/s]

11-06-2009 09:03
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235) Un filo conduttore è percorso da 15A, trovare B a 30cm dal filo. A che distanza dal filo B=Bterrestre? (Bterr=50uT)



[10uT; 6cm]

11-06-2009 09:06
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236)Due fili rettilinei conduttori molto lunghi e paralleli sono percorsi da I1=5A e I2=3A. Se la distanza tra loro è di 15cm, quanto vale B in mezzo ai due se le correnti hanno verso concorde o opposto?



[5,3uT; 21,3uT]

11-06-2009 09:08
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237) Una particella q=0,25nC viaggia in un B; all'istante t1 passa in un punto Aadove E=6N/C e B=0T, poi in t2 è in b dove E=0N/C e B=4T. Viaggia con v=2km/s e Theta=60° rispetto al campo B. Quanto vale F sulla particella in a e in b?



[F=0,15nN; F=1,74uN]

11-06-2009 09:10
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238) Una q=0,8nC viaggia in un campo elettromagnetico con E e B concordi e E=10N/C in modulo e B=0,2T in modulo. Se la particella ha velocità=100m/s perpendicolare al campo, che Forza di Lorentz subisce?




[77,9nN]

11-06-2009 09:13
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239) Calcolare il momento meccanico necessario a tener ferma una bobina rettangolare verticale di 12cm di altezza e 10cm di larghezza e formata da 40 spire, percorsa da 2A e sospesa in un B=0,25T uniforme. Si consideri il piano della bobina parallela alla direzione del campo.



[M=0,24Nm]

11-06-2009 09:15
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240) Un solenoide di 855 spire con area di 6 cm^2 è perpendicolare alle linee di un B uniforme prodotto da un magnete. Viene estratto dal campo in un deltat=25msec. Che forza elettromotrice indotta è prodotta dal solenoide se B=1,5T?


[3,06V]

11-06-2009 09:16
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