ࡱ> )+(7 .bjbjUU &>7|7| l$ $,,,,S1L}(  $ l- ]OS- ,,#  V,,  ` * , h;mA  0 A R Acciunea cmpului magnetic asupra curentului electric. Inductia cmpului magnetic. Pentru a exprima cantitativ proprietacile cmpului magnetic va trebui s definim o mrime fizic vectorial. Noua mrime fizic, notat cu simbolul EMBED Equation.3 , se nume_te induccie magnetic. Direccia vectorului induccie magnetic  EMBED Equation.3  ntr-un punct al cmpuli este tangent la linia de cmp magmetic n acel punct, iar sensul este acela_i cu al liniei de cmp.Pentru a defini modulul inducciei magnetice, vom porni, ca _i n cazul cmpuli electric, de la studiul acciunii pe care o exercit cmpul asupra corpului de prob. Drept corp de prob vom considera un conductor rectiliniu mobil, parcurs de curent electric. Din clasele anterioare _tici c forca pe care o exrcit cmpul magnetic asupra unui conductor strbtut de curent, numit forc electromagnetic ( EMBED Equation.3 ) este perpendicular pe direccia conductorului _i pe liniile cmpului magnetic, deci _i pe vectorul EMBED Equation.3 , iar sensul ei depinde de sensul curentului _i de sensul liniilor de cmp, deci _i de sensul vectorului  EMBED Equation.3  (fig10.7).Orientare forcei electromagnetice poate fi gsit cu ajutorul reguli minii stngi.Spre deosebire de cmpul electric, la care forca este orientat pe direccia cmpului electric  EMBED Equation.3 , n cmpul magnetic direccia forcei nu coincide cu direccia induccie magnetice  EMBED Equation.3 .  EMBED Word.Picture.8  EMBED Word.Picture.8  EMBED Word.Picture.8  EMBED Word.Picture.8  EMBED Word.Picture.8  Fig 10.7. Sensul forcei electromagnetice depinde de sensul curentului electric prin conductor _i de sensul cmpului magnetic. Pentru a gsi o expresie adecvat definiri lui  EMBED Equation.3 , vom studia factorii de care depinde forca electromagnetic. Experimentul 1. Se realizeaz dispozitivul din fig.10.9,a. Cadrul mobil se leag cu o aca de crligul de sub taler unei balance, montat pe aceea_i tij cu suportul cadrului. Cmpul magnetic ntre piesele polare ale bobinelor este aproape uniform. Se echilibreaz balanca _i se potrive_te cadrul cadrul n pozicie orizontal, la aproximativ 1cm de marginea superioar a pieselor polare, astfel nct latura lui mobil s fie ntre piesele polare (fig.10.9,b). Se alimenteaz cu tensiune continu bobinele _i cadrul. Balanca se dezechilibrez datorit forcei electromagnetice exercitate de cmpul magnetic produs de bobine asupra laturii mobile a cadrului, parcurs de curent.Reechilibrnd balanca cu etaloane de mas, se determin mrimea forcei electromagnetice. Mencinnd constant curentul prin bobine, se variaz intensitatea curentului I prin cadru. Se msoar forca electromagnetic la fiecare nou valoare a curentului I . Se constat c forca electromagnetic este direct proporcional cu intensitatea curentului prin conductor: F~I  EMBED Word.Picture.8  Fig.10.9. a)Dispozitiv pentru msurarea forcei electromagnetice :b)latura mobil a cadrului se a_eaz ntre piesele polare ale bobinelor. Un alt factor care poate influenca mrimea forcei electromagnetice este lungimea conductorului aflat n cmp.Astfel, dou conductoare de lungime egal, a_ezate n prelungire _i parcurse de acela_i curent, vor fi accionate mpreun de o forc dubl fac de cea exercitat asupra unuia singur, trei conductoare de o forc tripl etc.A_adar, forca electromagnetic este direct proporcional cu lungimea conductorului aflat n cmp: F~l. Pstrnd aceea_i intensitate a curentului prin bobine _i prin cadru, _i aceea_i lungime a laturii lui mobile, nlocuim latura mobil cu conductori din diferite materiale _i diferite grosimi. Constatm c forca electromagnetic nu se modific. A_adar, raportul F/Il este independent de corpul de prob. Pstrnd acelea_i valori pentru intensitatea curentului din cadru I _i lungimea laturii lui mobile l, variem intensitatea curentului din bobinele care produc cmpul magnetic _i masurm forca electromagnetic. Se constat c forca electromagnetic are de fiecare dat alt valoare. A_adar, raportul F/Il ; independent de corpul de prob si specific cmpului magnetic, poate servi pentru definirea inducciei magnetice, coform relaciei:  EMBED Equation.3  (10.1) Induccia unui cmp magnetic uniform este o mrime fizic vectorial, al crei modul este egal cu raportul dintre forca cu care acel cmp magnetic accioneaz asupra unui conductor rectiliniu, perpendicular pe liniile cmpului magnetic, _i produsul dintre intensitatea curentului din conductor _i lungimea conductorului, aflat n cmpul magnetic. Unitatea de msur a inducciei magnetice n SI se nume_te tesla, cu simbolul T:  EMBED Equation.3 . Un cmp magnetic uniform are inductia de 1T daca exercit o forc de 1N asupra fiecrui m din lungimea unui conductor, perpendicular pe cmp, parcurs de un curent cu intensitatea de 1A. Din relacia (10.1) rezult expresia forcei electromagnetice, n cazul unui conductor perpendicular pe liniile de cmp: F=Bil. 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