|
|
|
Mach chon song cua may thu vo tuen dien gom cuon day thuan cam va mot tu xoay . Tu xoay tu goc $0$ do den $120$ do thi dien dung bien thien tu $10pF$ den $250pF$. khi goc xoay o tu $8$ do thi mach thu dc song la $10m$ . Biet rang dien dung cua tu dien ti le bac nhat voi goc xoay .Muon bat dc song $20m$ thi tu can xoay $1$ goc bao nhieu?
|