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(-.1ira thi 2 day d6n
.C.
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B. dh1 nhau
khOng tuong tac D. d0u dao dQng
2l MOt Ong day dugc cu6n bdng topi day ma tiet diOn co ban kinh O.,smrrl sao cho ciic \,ong sat
/
nhau .Khi co dong dign 20A chay qua &i dO lcyn carrl Lrng tu trong long Ong day la
A. 4 rnT
B.BmT
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