Jaká je podmínka rezonance u oscilačního LC obvodu, jehož kmitání bylo vynuceno vnějším zdrojem harmonického střídavého proudu o úhlové frekvenci Ω, je‑li úhlová frekvence kmitání oscilátoru značena Ω0?
Který z následujících vztahů lze použít ke správnému výpočtu magnetického indukčního toku φ rovinnou plochou S, jestliže α je úhel svíraný normálou plochy S a vektorem magnetické indukce B?
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