Quiz — 655e0431df50f_énoncé_Oscillations électriques libres_ série 1.pdf

Question 1 sur 10 20:00

[{"id":18469,"question":"Dans un circuit RLC série, si on augmente la valeur de la résistance, que se passe-t-il pour les oscillations ?","option_a":"Les oscillations deviennent plus rapides","option_b":"Les oscillations s'amortissent plus rapidement","option_c":"La fréquence propre augmente","option_d":"L'énergie totale reste constante","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'augmentation de la résistance augmente l'amortissement, ce qui réduit la durée des oscillations et les fait disparaître plus vite.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Les oscillations deviennent plus rapides\", \"b\": \"Les oscillations","_debug_options_count":4},{"id":18470,"question":"La période propre d'un circuit RLC dépend-elle de la charge initiale du condensateur ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La période propre dépend uniquement des valeurs de L et C (T₀ = 2π√(LC)), pas de la charge initiale.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":18471,"question":"Quelle est l'expression de la fréquence propre f₀ d'un circuit RLC ?","option_a":"f₀ = 1\/(2π√(LC))","option_b":"f₀ = √(LC)\/(2π)","option_c":"f₀ = 2π√(LC)","option_d":"f₀ = LC\/(2π)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence propre est donnée par f₀ = 1\/(2π√(LC)), où L est l'inductance et C la capacité.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"f₀ = 1\/(2π√(LC))\", \"b\": \"f₀ = √(LC)\/(2π)\", \"c\": \"f₀ =","_debug_options_count":4},{"id":18472,"question":"Quel phénomène physique explique l'amortissement des oscillations dans un circuit RLC ?","option_a":"La conservation de l'énergie","option_b":"La dissipation d'énergie par effet Joule","option_c":"L'augmentation de la tension","option_d":"La diminution de l'inductance","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'amortissement est dû à la dissipation d'énergie sous forme de chaleur dans la résistance 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\": \"La conservation de l'énergie\", \"b\": \"La dissipation d'énergie p","_debug_options_count":4},{"id":18473,"question":"Dans un circuit RLC non amorti, l'énergie totale du système est-elle constante ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Dans un circuit RLC idéal (sans résistance), l'énergie totale est conservée et oscille entre le condensateur et la bobine.","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":18474,"question":"Quelle est la constante de temps τ d'un circuit RLC série ?","option_a":"τ = R\/L","option_b":"τ = L\/R","option_c":"τ = RC","option_d":"τ = √(L\/C)","option_e":"","option_f":"","bonne_reponse":"b","explication":"La constante de temps τ = L\/R caractérise la rapidité d'amortissement des oscillations dans un circuit RLC série.","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 = RC\", \"d\": \"τ = √(L\/C)\"}","_debug_options_count":4},{"id":18475,"question":"Si un circuit RLC a une inductance L = 0,1 H et une capacité C = 10 µF, quelle est sa fréquence propre ?","option_a":"159 Hz","option_b":"50 Hz","option_c":"100 Hz","option_d":"250 Hz","option_e":"","option_f":"","bonne_reponse":"a","explication":"Avec L = 0,1 H et C = 10 µF, f₀ = 1\/(2π√(0,1×10×10⁻⁶)) ≈ 159 Hz.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"159 Hz\", \"b\": \"50 Hz\", \"c\": \"100 Hz\", \"d\": \"250 Hz\"}}","_debug_options_count":4},{"id":18476,"question":"L'amortissement critique d'un circuit RLC correspond à une résistance maximale pour laquelle les oscillations disparaissent.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'amortissement critique se produit lorsque la résistance atteint une valeur critique Rc = 2√(L\/C), au-delà de laquelle il n'y a plus d'oscillations.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":18477,"question":"Quel est l'effet d'une augmentation de la capacité C sur la fréquence propre du circuit ?","option_a":"La fréquence augmente","option_b":"La fréquence diminue","option_c":"La fréquence reste inchangée","option_d":"La fréquence devient nulle","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fréquence propre f₀ = 1\/(2π√(LC)) diminue lorsque C augmente, car √(LC) augmente.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"La fréquence augmente\", \"b\": \"La fréquence diminue\", \"c\": \"La f","_debug_options_count":4},{"id":18478,"question":"Dans un circuit RLC en régime libre, l'énergie stockée dans le condensateur est maximale lorsque le courant est nul.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie stockée dans le condensateur est maximale lorsque la tension à ses bornes est maximale, ce qui correspond à un courant nul dans le 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\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]