ÌâÄ¿ÄÚÈÝ
3£®ÈçͼËùʾAÇò´ø¸ºµç£¬µçºÉÁ¿ÎªQ=-1¡Á10-7C£¬BµçºÉ´øÕýµç£¬µçºÉÁ¿Îªq=1¡Á10-8£¬AB¾ù¿ÉÊÓΪµãµçºÉ£®AÇò±»¾øÔµµ××ù¹Ì¶¨£¨Í¼ÖÐδ»³ö¾øÔµµ××ù£©£¬BÇòÔÚÖØÁ¦¡¢Éþ×ÓµÄÀÁ¦ÒÔ¼°¾²µçÁ¦×÷ÓÃÏ´¦ÓÚ¾²Ö¹×´Ì¬£¬ÒÑÖªABÖ®¼äµÄ¾àÀëΪ3m£¬Éþ×ÓÓëÊúÖ±·½ÏòµÄ¼Ð½ÇΪ30¡ã£¬£¨k=9.0¡Á109N•m2/C2£©Ôò£º£¨1£©µçºÉABÖ®¼äµÄ¾²µçÁ¦´óСÊǶàÉÙ£¿
£¨2£©µçºÉAÔÚBµã´¦µÄµç³¡Ç¿¶È´óСÊǶàÉÙ£¿·½ÏòÈçºÎ£¿
£¨3£©Éþ×ÓµÄÀÁ¦ÊǶàÉÙ£¿
·ÖÎö £¨1£©¸ù¾Ý¿âÂض¨ÂÉÇóµçºÉABÖ®¼äµÄ¾²µçÁ¦´óС£®
£¨2£©¸ù¾Ýµç³¡Ç¿¶ÈµÄ¶¨ÒåʽE=$\frac{F}{q}$£¬Çó³öµçºÉAÔÚBµã´¦µÄµç³¡Ç¿¶È´óС£¬²¢È·¶¨³¡Ç¿µÄ·½Ïò£®
£¨3£©BÇòÊÜÖØÁ¦¡¢ÀÁ¦ºÍ¾²µçÁ¦´¦ÓÚƽºâ£¬¸ù¾ÝºÏ³É·¨Çó³öÉþ×ÓµÄÀÁ¦£®
½â´ð ½â£º£¨1£©µçºÉABÖ®¼äµÄ¾²µçÁ¦´óСÊÇ F=k$\frac{Qq}{{r}^{2}}$=9¡Á109¡Á$\frac{1¡Á1{0}^{-7}¡Á1{0}^{-8}}{{3}^{2}}$=1¡Á10-6N
£¨2£©µçºÉAÔÚBµã´¦µÄµç³¡Ç¿¶È´óСÊÇ E=$\frac{F}{q}$=$\frac{1¡Á1{0}^{-6}}{1¡Á1{0}^{-8}}$=100N/C
ÓÉÓÚQÇò´ø¸ºµç£¬ËùÒÔµçºÉAÔÚBµã´¦µÄµç³¡Ç¿¶È·½ÏòÏò×ó£®
£¨3£©BÇòÊÜÖØÁ¦mg¡¢ÀÁ¦TºÍ¾²µçÁ¦F´¦ÓÚƽºâ£¬Èçͼ£¬¸ù¾ÝƽºâÌõ¼þµÃ
T=$\frac{F}{cos30¡ã}$=$\frac{1¡Á1{0}^{-6}}{\frac{\sqrt{3}}{2}}$=$\frac{2\sqrt{3}}{3}¡Á1{0}^{-6}$N
´ð£º£¨1£©µçºÉABÖ®¼äµÄ¾²µçÁ¦´óСÊÇ1¡Á10-6N£®
£¨2£©µçºÉAÔÚBµã´¦µÄµç³¡Ç¿¶È´óСÊÇ100N/C£¬·½ÏòÏòÓÒ×ó£®
£¨3£©Éþ×ÓµÄÀÁ¦ÊÇ$\frac{2\sqrt{3}}{3}¡Á1{0}^{-6}$N£®
µãÆÀ ½â¾ö±¾ÌâµÄ¹Ø¼üÕÆÎÕ¿âÂض¨ÂÉ¡¢µç³¡Ç¿¶ÈµÄ¶¨Òåʽ£¬»áÓúϳɷ¨Çó½â¹²µãÁ¦Æ½ºâÎÊÌ⣮
A£® | ÏßËٶȴó | B£® | ·¢ÉäËÙ¶ÈС | C£® | ÍòÓÐÒýÁ¦Ð¡ | D£® | ÏòÐļÓËٶȴó |
A£® | ÏÈ·ÅB³µºó·ÅA³µ£¨×¥×¡A³µµÄÊÖÔÚÊÍ·ÅÇ°±£³Ö²»¶¯£©£¬ÔòϵͳµÄ¶¯Á¿²»Êغã¶ø»úеÄÜÊغã | |
B£® | ÏÈ·ÅA³µºó·ÅB³µ£¨×¥×¡B³µµÄÊÖÔÚÊÍ·ÅÇ°±£³Ö²»¶¯£©£¬ÔòϵͳµÄ¶¯Á¿Êغã¶ø»úеÄܲ»Êغã | |
C£® | ÏÈ·ÅA³µ£¬ºóÓÃÊÖÍƶ¯B³µ£¬ÔòϵͳµÄ¶¯Á¿²»Êغ㣬»úеÄÜÒ²²»Êغã | |
D£® | Èôͬʱ·Å¿ªÁ½³µ£¬ÔòA¡¢BÁ½³µµÄ×ܶ¯Á¿ÎªÁã |
A£® | B£® | C£® | D£® |
A£® | Ö§³ÖÁ¦×ö¹¦Îªmgl | B£® | ÖØÁ¦×ö¹¦Îªmglcos¦È | ||
C£® | ÀÁ¦×ö¹¦ÎªFlcos¦È | D£® | »¬¶¯Ä¦²ÁÁ¦×ö¹¦Îª-¦Ìmgl |
A£® | °²ÅàÁ¦¶Ôab°ô×öÕý¹¦ | |
B£® | °²ÅàÁ¦¶Ôcd°ô×ö¸º¹¦ | |
C£® | abdca»Ø·µÄ´ÅͨÁ¿ÏÈÔö¼Óºó¼õÉÙ | |
D£® | F×öµÄ¹¦µÈÓڻط²úÉúµÄ×ÜÈÈÁ¿ºÍϵͳ¶¯ÄÜÔöÁ¿Ö®ºÍ |
A£® | ÔªµçºÉ¾ÍÊÇ´øµçÁ¿Îª1CµÄµãµçºÉ | |
B£® | ÓëijµãµçºÉ¾àÀëÏàͬµÄÁ½´¦µÄµç³¡Ç¿¶ÈÒ»¶¨Ïàͬ | |
C£® | µç³¡Êǿ͹۴æÔڵģ¬²¢ÓÉ·¨ÀµÚÊ×ÏÈÌá³öÓõ糡ÏßÈ¥Ãè»æ | |
D£® | µç³¡ÏßÊDZպϵÄÇúÏß |
A£® | 6.67¡Á10-9 | B£® | 6.67¡Á10-8 | C£® | 6.67¡Á10-7 | D£® | 6.67¡Á10-6 |