Question

em cần tl đúng ạ từ 9 đến hết ạ

Answer 1

9.\(F=k\cdot\dfrac{\left|q_1q_2\right|}{\varepsilon\cdot r^2}\)

\(\Rightarrow B\)

10.\(A_{ng}=\xi\cdot I\cdot t\)\(\Rightarrow C\)

11.\(\Rightarrow A\)

13.\(\Rightarrow D\)

14.\(C=\dfrac{Q}{U}\Rightarrow A\)

15.\(\Rightarrow D\)

16.\(U=\dfrac{A}{q}=\dfrac{-6}{-2}=3V\Rightarrow D\)

 17.\(F=k\cdot\dfrac{\left|q_1q_2\right|}{r^2}=9\cdot10^9\cdot\dfrac{\left|10^{-7}\cdot4\cdot10^{-7}\right|}{r^2}=0,1\)

\(\Rightarrow r=0,06m=6cm\Rightarrow B\)

18.\(F=k\cdot\dfrac{\left|q_1q_2\right|}{r^2}=9\cdot10^9\cdot\dfrac{\left|-4\cdot10^{-5}\cdot5\cdot10^{-5}\right|}{0,05^2}=7200N\Rightarrow B\)