Hiện tượng nhiễm điện do cọ xát

Home Lớp 8 Khoa học tự nhiên 8 - sách Kết nối tri thức Bài 20: Hiện tượng nhiễm điện do cọ xátBài tập nâng cao

{"common":{"save":0,"post_id":"9065","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9577","post_id":"9065","mon_id":"1159539","chapter_id":"1159897","question":"M\u1ed9t thanh nh\u1ef1a A nhi\u1ec5m \u0111i\u1ec7n âm sau khi c\u1ecd xát. Khi \u0111\u01b0a l\u1ea1i g\u1ea7n m\u1ed9t qu\u1ea3 c\u1ea7u B \u0111ang trung hòa v\u1ec1 \u0111i\u1ec7n, qu\u1ea3 c\u1ea7u B ban \u0111\u1ea7u b\u1ecb hút v\u1ec1 phía A. N\u1ebfu cho qu\u1ea3 c\u1ea7u B ti\u1ebfp xúc v\u1edbi A r\u1ed3i tách ra, hi\u1ec7n t\u01b0\u1ee3ng nào x\u1ea3y ra?<\/p>","options":["A. Qu\u1ea3 c\u1ea7u B nhi\u1ec5m \u0111i\u1ec7n âm","B. Qu\u1ea3 c\u1ea7u B nhi\u1ec5m \u0111i\u1ec7n d\u01b0\u01a1ng","C. Qu\u1ea3 c\u1ea7u B v\u1eabn trung hòa \u0111i\u1ec7n","D. Qu\u1ea3 c\u1ea7u B m\u1ea5t kh\u1ea3 n\u0103ng hút các v\u1eadt nh\u1eb9"],"correct":"1","level":"3","hint":"- Ti\u1ebfp xúc → \u0111i\u1ec7n tích có th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt này sang v\u1eadt kia.<\/p>- A nhi\u1ec5m \u0111i\u1ec7n âm → truy\u1ec1n b\u1edbt electron cho B.<\/p>","answer":"\u0110áp án \u0111úng là:<\/strong> A. Qu\u1ea3 c\u1ea7u B nhi\u1ec5m \u0111i\u1ec7n âm<\/p>Gi\u1ea3i thích:<\/strong> Khi ti\u1ebfp xúc, m\u1ed9t ph\u1ea7n electron t\u1eeb A (\u0111ang th\u1eeba electron) s\u1ebd truy\u1ec1n sang B, khi\u1ebfn B c\u0169ng nhi\u1ec5m \u0111i\u1ec7n âm.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-05-02 08:54:39","option_type":"txt","len":3},{"id":"9578","post_id":"9065","mon_id":"1159539","chapter_id":"1159897","question":"M\u1ed9t th\u01b0\u1edbc nh\u1ef1a \u0111\u01b0\u1ee3c c\u1ecd xát b\u1eb1ng kh\u0103n len và sau \u0111ó hút c\u1ea3 hai lo\u1ea1i: v\u1ee5n gi\u1ea5y và v\u1ee5n nilon. Bi\u1ebft r\u1eb1ng v\u1ee5n gi\u1ea5y ban \u0111\u1ea7u trung hòa \u0111i\u1ec7n, còn v\u1ee5n nilon \u0111ã nhi\u1ec5m \u0111i\u1ec7n âm. \u0110i\u1ec1u này ch\u1ee9ng t\u1ecf:<\/p>","options":["A. Th\u01b0\u1edbc nh\u1ef1a nhi\u1ec5m \u0111i\u1ec7n âm, l\u1ef1c hút m\u1ea1nh h\u01a1n v\u1edbi v\u1ee5n gi\u1ea5y","B. Th\u01b0\u1edbc nh\u1ef1a nhi\u1ec5m \u0111i\u1ec7n âm, l\u1ef1c \u0111\u1ea9y v\u1ee5n nilon nh\u01b0ng hút v\u1ee5n gi\u1ea5y","C. Th\u01b0\u1edbc nh\u1ef1a nhi\u1ec5m \u0111i\u1ec7n d\u01b0\u01a1ng, hút c\u1ea3 v\u1ee5n gi\u1ea5y và v\u1ee5n nilon","D. Th\u01b0\u1edbc nh\u1ef1a không nhi\u1ec5m \u0111i\u1ec7n, ch\u1ec9 hút do tr\u1ecdng l\u1ef1c"],"correct":"2","level":"3","hint":"- V\u1eadt nhi\u1ec5m \u0111i\u1ec7n âm s\u1ebd \u0111\u1ea9y v\u1eadt nhi\u1ec5m \u0111i\u1ec7n âm khác.<\/p>- V\u1eadt nhi\u1ec5m \u0111i\u1ec7n có th\u1ec3 hút v\u1eadt trung hòa \u0111i\u1ec7n do c\u1ea3m \u1ee9ng.<\/p>","answer":"\u0110áp án \u0111úng là:<\/strong> B. Th\u01b0\u1edbc nh\u1ef1a nhi\u1ec5m \u0111i\u1ec7n âm, l\u1ef1c \u0111\u1ea9y v\u1ee5n nilon nh\u01b0ng hút v\u1ee5n gi\u1ea5y<\/p>Gi\u1ea3i thích:<\/strong><\/p>- Th\u01b0\u1edbc nh\u1ef1a nhi\u1ec5m \u0111i\u1ec7n âm s\u1ebd \u0111\u1ea9y v\u1ee5n nilon (c\u0169ng âm).<\/p>- Nh\u01b0ng th\u01b0\u1edbc v\u1eabn hút v\u1ee5n gi\u1ea5y trung hòa \u0111i\u1ec7n nh\u1edd hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-05-02 15:43:21","option_type":"txt","len":3},{"id":"9579","post_id":"9065","mon_id":"1159539","chapter_id":"1159897","question":"Trong m\u1ed9t ngày hanh khô, b\u1ea1n An ch\u1ea3i \u0111\u1ea7u b\u1eb1ng l\u01b0\u1ee3c nh\u1ef1a thì th\u1ea5y tóc b\u1ecb d\u1ef1ng lên và bám vào l\u01b0\u1ee3c. Hi\u1ec7n t\u01b0\u1ee3ng này x\u1ea3y ra do:<\/p>","options":["A.<\/strong> Tóc b\u1ecb khô do thi\u1ebfu \u0111\u1ed9 \u1ea9m.","B.<\/strong> L\u01b0\u1ee3c nh\u1ef1a b\u1ecb nhi\u1ec5m \u0111i\u1ec7n do c\u1ecd xát, hút tóc mang \u0111i\u1ec7n tích khác.","C.<\/strong> L\u01b0\u1ee3c nh\u1ef1a làm tóc nh\u1eb9 \u0111i.","D.<\/strong> Tóc b\u1ecb nhi\u1ec5m t\u1eeb nên hút l\u01b0\u1ee3c."],"correct":"2","level":"3","hint":"C\u1ecd xát làm v\u1eadt nhi\u1ec5m \u0111i\u1ec7n, có th\u1ec3 hút các v\u1eadt khác mang \u0111i\u1ec7n tích trái d\u1ea5u.<\/p>","answer":"\u0110áp án \u0111úng là:<\/strong> B. L\u01b0\u1ee3c nh\u1ef1a b\u1ecb nhi\u1ec5m \u0111i\u1ec7n do c\u1ecd xát, hút tóc mang \u0111i\u1ec7n tích khác.<\/p>Gi\u1ea3i thích:<\/em><\/p>L\u01b0\u1ee3c nh\u1ef1a khi ch\u1ea3i tóc b\u1ecb nhi\u1ec5m \u0111i\u1ec7n do c\u1ecd xát. Các \u0111i\u1ec7n tích khác d\u1ea5u gi\u1eefa tóc và l\u01b0\u1ee3c t\u1ea1o ra l\u1ef1c hút làm tóc bám vào l\u01b0\u1ee3c.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-05-02 15:49:03","option_type":"txt","len":3}]}