Quiz — 655dfe75c958c_énoncé_Série 2- Dipole RL.pdf

Question 1 sur 10 20:00

[{"id":74200,"question":"Quel est l'effet d'une bobine dans un circuit électrique ?","option_a":"Elle bloque le courant continu","option_b":"Elle s'oppose aux variations de courant","option_c":"Elle augmente la tension","option_d":"Elle diminue la résistance","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une bobine s'oppose aux variations de courant grâce à sa propriété d'auto-induction, ce qui génère une tension opposée aux variations (loi de Lenz).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Elle bloque le courant continu\", \"b\": \"Elle s'oppose aux variatio","_debug_options_count":4},{"id":74201,"question":"La constante de temps τ d'un circuit RL est donnée par :","option_a":"τ = R\/L","option_b":"τ = L\/R","option_c":"τ = R × L","option_d":"τ = L²\/R","option_e":"","option_f":"","bonne_reponse":"b","explication":"La constante de temps τ = L\/R détermine le temps nécessaire pour que le courant atteigne environ 63% de sa valeur finale en régime transitoire.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"τ = R\/L\", \"b\": \"τ = L\/R\", \"c\": \"τ = R × L\", \"d\": \"τ = L²\/R\"","_debug_options_count":4},{"id":74202,"question":"Vrai ou Faux ? L'énergie emmagasinée dans une bobine est proportionnelle au carré de l'intensité du courant.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie est bien proportionnelle au carré de l'intensité : E = ½LI², ce qui signifie qu'elle augmente rapidement avec le courant.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":74203,"question":"Quelle est l'unité de l'inductance L ?","option_a":"Volt (V)","option_b":"Henry (H)","option_c":"Farad (F)","option_d":"Ohm (Ω)","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'inductance L s'exprime en Henry (H), qui équivaut à V·s\/A (volt-seconde par ampère).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Volt (V)\", \"b\": \"Henry (H)\", \"c\": \"Farad (F)\", \"d\": \"Ohm (Ω)\"}}","_debug_options_count":4},{"id":74204,"question":"En régime permanent continu, la bobine se comporte comme :","option_a":"Un court-circuit","option_b":"Un circuit ouvert","option_c":"Une résistance nulle","option_d":"Une source de tension","option_e":"","option_f":"","bonne_reponse":"a","explication":"En régime permanent continu, la tension aux bornes de la bobine est nulle (car di\/dt = 0), donc elle se comporte comme un fil (court-circuit).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Un court-circuit\", \"b\": \"Un circuit ouvert\", \"c\": \"Une résistanc","_debug_options_count":4},{"id":74205,"question":"Vrai ou Faux ? La tension aux bornes d'une bobine est toujours opposée à la variation de courant.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"D'après la loi de Lenz, la tension induite dans une bobine s'oppose à la variation du courant qui l'a créée (u = L·di\/dt).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":74206,"question":"Quel est l'effet d'une augmentation de l'inductance L sur la constante de temps τ ?","option_a":"τ diminue","option_b":"τ augmente","option_c":"τ reste inchangée","option_d":"τ devient nulle","option_e":"","option_f":"","bonne_reponse":"b","explication":"Puisque τ = L\/R, une augmentation de L entraîne une augmentation de τ, ce qui ralentit la réponse du circuit.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"τ diminue\", \"b\": \"τ augmente\", \"c\": \"τ reste inchangée\", \"d\":","_debug_options_count":4},{"id":74207,"question":"Dans un circuit RL série, la tension totale est égale à :","option_a":"La somme des tensions aux bornes de R et L","option_b":"La différence des tensions aux bornes de R et L","option_c":"La tension aux bornes de R uniquement","option_d":"La tension aux bornes de L uniquement","option_e":"","option_f":"","bonne_reponse":"a","explication":"D'après la loi des mailles, la tension totale U = UR + UL, où UR = RI et UL = L·di\/dt.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"La somme des tensions aux bornes de R et L\", \"b\": \"La différence","_debug_options_count":4},{"id":74208,"question":"Vrai ou Faux ? Une bobine idéale ne dissipe pas d'énergie sous forme de chaleur.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une bobine idéale (sans résistance interne) ne dissipe pas d'énergie par effet Joule, contrairement à une résistance.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":74209,"question":"Quelle est la dimension de l'inductance L dans le système international ?","option_a":"M·L²·T⁻²·I⁻²","option_b":"M·L²·T⁻²·I⁻¹","option_c":"M·L·T⁻²·I⁻²","option_d":"M·L·T⁻¹·I⁻²","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'inductance a pour dimension M·L²·T⁻²·I⁻², car U = L·di\/dt ⇒ L = U·dt\/di (en V·s\/A = H).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"M·L²·T⁻²·I⁻²\", \"b\": \"M·L²·T⁻²·I⁻¹\", \"c\": \"M·","_debug_options_count":4}]