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ngochan562001
2 năm trước
Cường độ dòng điện trong một mạch dao động LC lí tưởn có phương trình $i=2cos$($2.10^{7}$t$+ $$\frac{\pi}{2}$) (mA) (t tính bằng giây). Điện tích của một bản tụ điện ỏ thời điểm $\frac{\pi }{20}$ (micro s) có độ lớn là A. 0,05 nC B. 0,1 micro C C. 0,0,5 micro C D. 0,1 nC
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