ÌâÄ¿ÄÚÈÝ
£¨15·Ö£©·´ÉäʽËÙµ÷¹ÜÊdz£ÓõÄ΢²¨Æ÷¼þÖ®Ò»£¬ËüÀûÓõç×ÓÍÅÔڵ糡ÖеÄÕñµ´À´²úÉú΢²¨£¬ÆäÕñµ´ÔÀíÓëÏÂÊö¹ý³ÌÀàËÆ¡£ÈçͼËùʾ£¬ÔÚÐéÏßMNÁ½²à·Ö±ð´æÔÚ×Å·½ÏòÏà·´µÄÁ½¸öÔÈÇ¿µç³¡£¬Ò»´øµç΢Á£´ÓAµãÓɾ²Ö¹¿ªÊ¼£¬Ôڵ糡Á¦×÷ÓÃÏÂÑØÖ±ÏßÔÚA¡¢BÁ½µã¼äÍù·µÔ˶¯¡£ÒÑÖªµç³¡Ç¿¶ÈµÄ´óС·Ö±ðÊÇE1=2.0¡Á103N/CºÍE2=4.0¡Á103N/C£¬·½ÏòÈçͼËùʾ¡£´øµç΢Á£ÖÊÁ¿m=1.0¡Á10-20kg£¬´øµçÁ¿q=-1.0¡Á10-9C£¬Aµã¾àÐéÏßMNµÄ¾àÀëd1=1.0cm£¬²»¼Æ´øµç΢Á£µÄÖØÁ¦£¬ºöÂÔÏà¶ÔÂÛЧӦ¡£Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241247197471149.gif)
¢ÅBµãµ½ÐéÏßMNµÄ¾àÀëd2£»
¢Æ´øµç΢Á£´ÓAµãÔ˶¯µ½BµãËù¾ÀúµÄʱ¼ät¡£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241247197471149.gif)
¢ÅBµãµ½ÐéÏßMNµÄ¾àÀëd2£»
¢Æ´øµç΢Á£´ÓAµãÔ˶¯µ½BµãËù¾ÀúµÄʱ¼ät¡£
£®£¨1£©0.50 cm£¨2£©1.5¡Á10-8 s
£¨1£©´øµç΢Á£ÓÉAÔ˶¯BµÄ¹ý³ÌÖУ¬Óɶ¯Äܶ¨ÀíÓÐ|q|E1d1£|q|E2d2 = 0
½âµÃ¡¡d2 =
=" 0.50" cm
£¨2£©Éè΢Á£ÔÚÐéÏßMNÁ½²àµÄ¼ÓËٶȴóС·Ö±ðΪa1¡¢a2£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÓÐ
|q|E1 = ma1
|q|E2 = ma2
Éè΢Á£ÔÚÐéÏßMNÁ½²àµÄʱ¼ä´óС·Ö±ðΪt1¡¢t2£¬ÓÉÔ˶¯Ñ§¹«Ê½ÓÐ
d1 =![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124719872433.gif)
d2 =![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124719872430.gif)
ÓÖt = t1+t2
½âµÃ¡¡t = 1.5¡Á10-8 s
½âµÃ¡¡d2 =
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124719856457.gif)
£¨2£©Éè΢Á£ÔÚÐéÏßMNÁ½²àµÄ¼ÓËٶȴóС·Ö±ðΪa1¡¢a2£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÓÐ
|q|E1 = ma1
|q|E2 = ma2
Éè΢Á£ÔÚÐéÏßMNÁ½²àµÄʱ¼ä´óС·Ö±ðΪt1¡¢t2£¬ÓÉÔ˶¯Ñ§¹«Ê½ÓÐ
d1 =
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124719872433.gif)
d2 =
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124719872430.gif)
ÓÖt = t1+t2
½âµÃ¡¡t = 1.5¡Á10-8 s
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿