A.faces
B.legs
C.hands
D.stomachs

A.V (Vôn)
B.W (Oát)
C.A (Ampe)
D.V/m (Vôn/mét)

A.cùng pha nhau.
B.lệch pha nhau \(\frac{\pi }{4}\).
C.ngược pha nhau.
D.lệch pha nhau \(\frac{\pi }{2}\).

A.êlectron  
B.nơtron
C.pôzitron
D.prôtôn

A.2,11 eV.
B.4,22 eV.
C.0,42 eV.
D.0,21 eV.

A.\(\frac{E}{{{E_0}}} =  - \frac{B}{{{B_0}}}\)  
B.\(\frac{E}{{{E_0}}} = \frac{B}{{{B_0}}}\)
C.\({\left( {\frac{E}{{{E_0}}}} \right)^2} + {\left( {\frac{B}{{{B_0}}}} \right)^2} = 1\)
D.\({\left( {\frac{E}{{{E_0}}}} \right)^2} + {\left( {\frac{B}{{{B_0}}}} \right)^2} = 2\)

A.\(4\pi H{\rm{z}}\)
B.2Hz.
C.0,5 Hz.
D.4 Hz.

A.\(2\pi \sqrt {\frac{g}{l}} \)
B.\(\frac{1}{{2\pi }}\sqrt {\frac{l}{g}} \)  
C.\(\frac{1}{{2\pi }}\sqrt {\frac{g}{l}} \)  
D.\(2\pi \sqrt {\frac{l}{g}} \)

A.\(\lambda  = \frac{f}{v}\)
B.\(\lambda  = vf\)
C.\(\lambda  = 2\pi fv\)
D.\(\lambda  = \frac{v}{f}\)

A.\(P = EI\)
B.\(P = \frac{1}{2}E{I^2}\)
C.\(P = \frac{1}{2}U{I^2}\)
D.\(P = UI\)