Giúp mik câu 60,62 vs ạ. Chi tiết

Câu 60: D

Ta có: 

\(\begin{array}{l}
{\left( {\dfrac{u}{{{U_0}}}} \right)^2} + {\left( {\dfrac{i}{{{I_0}}}} \right)^2} = 1\\
 \Rightarrow {\left( {\dfrac{u}{1}} \right)^2} + {\left( {\dfrac{{100}}{{200}}} \right)^2} = 1\\
 \Rightarrow u = 0,5\sqrt 3 V
\end{array}\)

Câu 62: A

Ta có: 

\(\begin{array}{l}
{\left( {\dfrac{i}{{{I_0}}}} \right)^2} + {\left( {\dfrac{q}{{{q_0}}}} \right)^2} = 1\\
 \Rightarrow {\left( {\dfrac{1}{n}} \right)^2} + {\left( {\dfrac{q}{{{q_0}}}} \right)^2} = 1\\
 \Rightarrow {\left( {\dfrac{q}{{{q_0}}}} \right)^2} = 1 - \dfrac{1}{{{n^2}}}\\
 \Rightarrow q = {q_0}.\sqrt {1 - \dfrac{1}{{{n^2}}}} 
\end{array}\)