ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬ÔÚxOyƽÃæ×ø±êϵµÄµÚÒ»ÏóÏÞÄÚµÄijÇøÓò´æÔÚÔÈÇ¿´Å³¡£¬ÔÚµÚ¶þÏóÏÞÄÚ´æÔÚÑØxÕý·½ÏòµÄÔÈÇ¿µç³¡£¬µç³¡Ç¿¶ÈµÄ´óСΪE=5¡Á103V/m¡£ÇúÏßOCÉÏ·Ö²¼×Å´óÁ¿±ÈºÉΪ =105C/kgµÄÕýµçºÉ£¬ÇúÏßOCÉϸ÷µãµÄ×ø±êÂú×ãy2=k|x|£¬CµãµÄ×ø±êΪ(£0.1£¬0.2)¡£AµãÔÚyÖáÉÏ£¬CAÁ¬ÏßƽÐÐÓÚxÖᣬDµãÔÚxÖáÉÏÇÒOD=OA¡£ÏÖËùÓÐÕýµçºÉÓɾ²Ö¹ÊÍ·Å£¬ÔÚµÚÒ»ÏóÏÞÄڴų¡µÄ×÷ÓÃ϶¼ÑØ´¹Ö±xÖá·½Ïòͨ¹ýÁËDµã¡£²»¼ÆÕýµçºÉËùÊܵÄÖØÁ¦¼°µçºÉ¼äµÄÏ໥×÷ÓÃÁ¦¡£Çó£º
(1)ÕýµçºÉͨ¹ýyÖáʱµÄËÙ¶ÈÓë×Ý×ø±êµÄ¹Øϵ£»
(2)ÔÈÇ¿´Å³¡µÄ´Å¸ÐӦǿ¶ÈµÄ´óСºÍ·½Ïò£»
(3)ÔÈÇ¿´Å³¡ÇøÓòµÄ×îСÃæ»ý¡£
¡¾´ð°¸¡¿(1)v==5¡Á105y£»(2)B=5¡Á105=5T£¬´Å¸ÐӦǿ¶ÈµÄ·½ÏòΪ´¹Ö±Ö½ÃæÏòÍ⣻(3)1.14¡Á10£2m2
¡¾½âÎö¡¿
(1)µÚ¶þÏóÏÞÄÚ£¬ÕýµçºÉÔڵ糡Á¦µÄ×÷ÓÃÏÂ×ö³õËÙΪÁãµÄÔȼÓËÙÔ˶¯£¬ÉèÕýµçºÉµÄ×ø±êΪ(x£¬y)£¬Í¨¹ýyÖáʱµÄËÙ¶ÈΪv£¬Óɶ¯Äܶ¨ÀíÓÐ
Eq=mv2
ÓÉÓÚy2=k£¬CµãµÄ×ø±êΪ(£0.1£¬0.2)£¬µÃ
k=0.4
ÁªÁ¢µÃ
v==5¡Á105y
(2)ÓÉCµã¾²Ö¹ÊͷŵÄÕýµçºÉ´¹Ö±yÖáͨ¹ýAµã£¬ÓÖ´¹Ö±xÖáͨ¹ýDµã£¬ËùÒÔ¸ÃÕýµçºÉÓÉAµã½øÈë´Å³¡£¬ÓÉDµã³ö´Å³¡£¬Ô²ÖÜÔ˶¯µÄÔ²ÐÄΪOµã£¬¹ì¼£ÈçͼËùʾ
¸ÃÕýµçºÉ×öÔ²ÖÜÔ˶¯µÄ°ë¾¶
r=OA=0.2m
ÓÉÂåÂØ×ÈÁ¦ÌṩÏòÐÄÁ¦£¬ÓÐ
qvB=
ÁªÁ¢£¬µÃ
B=5¡Á105=5T
ÓÉ×óÊÖ¶¨Ôò¿ÉÅжϣ¬´Å¸ÐӦǿ¶ÈµÄ·½ÏòΪ´¹Ö±Ö½ÃæÏòÍâ
(3)ÓÉ(2)ÖзÖÎö¿ÉÖªÕýµçºÉÔڴų¡ÖÐÔ²ÖÜÔ˶¯µÄ°ë¾¶ÓëÆäͨ¹ýyÖáʱµÄ×Ý×ø±êÖµÏàµÈ£¬ËùÓÐÕýµçºÉ¶¼´¹Ö±Í¨¹ýDµã£¬¹ì¼£ÈçͼËùʾ
´Å³¡ÇøÓòµÄ×îСÃæ»ýΪÒõÓ°²¿·ÖµÄÃæ»ý£¬Óɼ¸ºÎ¹Øϵ¿ÉµÃÃæ»ý
S==1.14¡Á10£2m2