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Tranquocluc
2 năm trước
Câu 16: Hai quả cầu bấc cùng bị nhiễm điện cùng loại và được treo trên hai sợi chỉ mảnh riêng biệt. Khi đưa hai quả cầu đó lại gần nhau thì có hiện tượng gì xảy ra? Chúng đẩy nhau.Chúng hút nhau.Không có hiện tượng gì xảy ra.Chúng vừa hút vừa đẩy. Câu 17: Khi mắc ampe kế vào mạch điện thì cần chú ý điều gì sau đây? Mắc trực tiếp hai chốt của ampe kế vào hai cực của nguồn điện. Chốt âm của ampe kế mắc vào cực dương của nguồn điện và chốt dương mắc với bóng đèn. Chốt dương của ampe kế mắc vào cực âm của nguồn điện và chốt âm mắc với bóng đèn. Không được mắc trực tiếp hai chốt của ampe kế vào nguồn điện.
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