'Phan tich vd hixang ddn gidi
Neu hop X la cupn day thuan cam thi mach gom C, noi tiep voi L v i theta c6:
U A B = - ^AU « 2 2 0 = 2 6 0 - 1 2 0 = 1 4 0 (v6 ly) v i the dap an A sai
Neu hop X la dien tro thuan thi mach gom C, noi tiep v o i R v i theta c6: U i e = U A M + ^u^ « 220^ = 120^ + 260^ (v6 ly) v i the dap an C sai
Neu hop X la tu dien thi mach gom C, noi tiep voi C v i the ta c6:
U A B = U A M + U ^ B <^ 2 2 0 = 2 6 0 + 1 2 0 = 3 8 0 (v6 ly) v i the dap an D sai
T6i day chi con dap an B v i the chac chan la d i i n g va sau day la ly luan de B d i i n g .
N e u hop X la cupn day khpng thuan cam (L,r) thi mach gom C, noi tiep voi (L, r) v i the ta c6:
U ^ B =U? + ( U L - U c f = U ^ - 2 U L U C ' ' U M B + U A M - U J B 2 6 0 ^ + 1 2 0 ^ - 2 2 0 ^ U M B + U A M - U J B 2 6 0 ^ + 1 2 0 ^ - 2 2 0 ^
2 U A M 2.120
= V U M B - U L = 7 2 6 0 ^ - 1 4 0 ^ = 4oV30V thoa man gia thiet de cho
the dap an B diing
VI