A.
B.
C.
D.

A.10 vòng
B.20 vòng
C.50 vòng
D.16 vòng

A.800 vòng
B.1600 vòng
C.600 vòng
D.1800 vòng

A.\(\dfrac{{{N_1}}}{{{N_2}}} = \dfrac{1}{2}.\)
B.\(\dfrac{{{N_1}}}{{{N_2}}} = \dfrac{1}{4}.\)
C.\(\dfrac{{{N_1}}}{{{N_2}}} = \dfrac{2}{1}.\)
D.\(\dfrac{{{N_1}}}{{{N_2}}} = \dfrac{4}{1}.\)

A.200 V
B.220 V
C.100 V
D.110 V

A.U' = 31,75 V
B.U' = 542,93 V
C.U' = 317,14 V
D.U' = 33,13 V

A.N1 = 825vòng.
B.N1 = 1320vòng.
C.N1 = 1170vòng.
D.N1 = 975vòng.

A.84 %.
B.98%.
C.94%.
D.88%.

A.\(I\left( {2; - 2;3} \right),\,\,R = 9\)
B.\(I\left( {1; - 1;\dfrac{3}{2}} \right),\,\,R = \dfrac{9}{2}\)         
C.\(I\left( {1; - 1;\dfrac{3}{2}} \right),\,\,R = 9\)
D.\(I\left( {2; - 2;3} \right),\,\,R = \dfrac{9}{2}\)

A.\({x^2} + \ln \left| {x - 1} \right| + C.\)
B.\(1 + \dfrac{1}{{{{\left( {x - 1} \right)}^2}}} + C.\)
C.\(x + \dfrac{1}{{x - 1}} + C.\)
D.\(\dfrac{{{x^2}}}{2} + \ln \left| {x - 1} \right| + C\)