COS(100 )I T Π3 Π  Π 200 2 COS 100 ( )U T Π V=  − =  − U T Π...

4.cos(100 )i t π3 π 200 2 cos 100 ( )u t π V=  − 

A.

7  

^B.

200 2 cos 100 ( )12=  + 

C.

200 2 cos 100 ( ) 

^D.

200cos 100 ( )4

Giải

' 40 10 50

R = + = R r + = Ω

1 1