ÌâÄ¿ÄÚÈÝ
3£®ÈçͼËùʾ£¬A¡¢B¡¢CΪÔÈÇ¿µç³¡ÖеÄÈý¸öµã£¬ÒÑÖª¡ÏCAB=60¡ã£¬AB=2AC=2cm£¬¦ÕA=0V¡¢¦ÕB=-8V£¬½«Ò»´øµçÁ¿Îªq=3¡Á10-5CµÄÕýµçºÉ´ÓAµãÒƵ½Cµã£¬µç³¡Á¦×ö¹¦6¡Á10-5J£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | CµãµçÊÆΪ2V | |
B£® | µç³¡Ç¿¶ÈEÑØAB·½ÏòÓÉA¡úB£¬´óСΪ400N/C | |
C£® | ¸ÃÕýµçºÉÔÚBµã¾ßÓеĵçÊÆÄÜΪ2.4¡Á10-4J | |
D£® | ½«¸ÃÕýµçºÉ´ÓCµãÒƵ½Bµã£¬µçÊÆÄÜÔö¼ÓÁË1.8¡Á10-4J |
·ÖÎö A£º¸ù¾Ý£ºUAC=$\frac{W{\;}_{AC}}{q}$£»UAC=¦ÕA-¦ÕC£¬¿ÉÇó³öCµãµçÊÆ£®
B£ºÈô¹ýCµã×÷ABµÄ´¹Ïߣ¬Ôò½»µãDΪABµÄËĵȷֵ㣬¿ÉÖªDµãµçÊÆΪ-2v£¬CDΪµÈÊÆÏ߸ù¾Ýµç³¡ÏßÓëµÈÊÆÃæ´¹Ö±£¬¿ÉÒԵóö³¡Ç¿EµÄ·½Ïò£¬¸ù¾ÝE=$\frac{U}{d}$¿ÉÒÔÇó³ö³¡Ç¿E´óС£®
C£º¸ù¾ÝEP=¦Õq£¬¿ÉÒÔÇó³öÕýµçºÉÔÚBµã¾ßÓеĵçÊÆÄÜ£®
D£º¸ù¾ÝWCB=UCBq¾Í¿ÉÒÔÇó³öWCB£¬µç³¡Á¦×öÕý¹¦£¬µçÊÆÄܼõÉÙ£®
½â´ð ½â£ºA£ºÉèACÖ®¼äµÄµçÊƲîΪUAC£¬ÔòUAC=$\frac{W{\;}_{AC}}{q}$=$\frac{6¡Á10{\;}^{-5}}{3¡Á10{\;}^{-5}}$=2v£»UAC=¦ÕA-¦ÕC
½«¦ÕA=0V´úÈëµÃ£º0-¦ÕC=2v
µÃ£º¦ÕC=-2v£®¹ÊA´íÎó£®
B£ºÈô¹ýCµã×÷ABµÄ´¹Ïߣ¬Ôò½»µãDΪABµÄËĵȷֵ㣬¿ÉÖªDµãµçÊÆΪ-2v£¬CDΪµÈÊÆÏߣ¬³¡Ç¿´¹Ö±CD£¬
¼´µç³¡Ç¿¶ÈEÑØAB·½ÏòÓÉA¡úB
E=$\frac{U{\;}_{AB}}{AB}$=$\frac{8v}{0.02}$v=400v/m
¹ÊBÕýÈ·£®
C£º¸ù¾ÝEP=¦Õq£¬½«¦ÕB=-8v£¬q=3¡Á10-5C´úÈëµÃ£º
EPB=£¨-8£©¡Á3¡Á10-5 J=-2.4¡Á10-4 J
¹ÊC´íÎó£®
D£ºUCB=¦ÕC-¦ÕB=6v£»WCB=UCBq=£¨3¡Á10-5¡Á6£©J=1.8¡Á10-4J
ËùÒԵ糡Á¦×öÕý¹¦£¬µçÊÆÄܼõÉÙ1.8¡Á10-4J
¹ÊD´íÎó£®
¹ÊÑ¡£ºB£®
µãÆÀ ´ËÌâÊǶԾ²µç³¡ÖеçÊÆ¡¢µçÊÆÄÜÒÔ¼°µç³¡Ç¿¶ÈµÄ¿¼²ì£¬ÊìÁ·°ÑÎյ糡ÏßÓëµÈÊÆÃæ´¹Ö±ÕâÒ»ÐÔÖÊ£¬¾Í¿ÉÒԵóö³¡Ç¿EµÄ·½Ïò£¬½ø¶ø¸ù¾ÝE=$\frac{U}{d}$Çó³öE£®
A£® | $\sqrt{2}$£º1 | B£® | $\sqrt{2}$£º2 | C£® | 2£º1 | D£® | 4£º1 |
A£® | ËùÓÐÐÐÐÇÈÆÌ«ÑôÔ˶¯µÄ¹ìµÀ¶¼ÊÇÔ² | |
B£® | ËùÓÐÐÐÐÇÈÆÌ«ÑôÔ˶¯µÄ¹ìµÀ¶¼ÊÇÍÖÔ² | |
C£® | ²»Í¬ÐÐÐÇÈÆÌ«ÑôÔ˶¯µÄÍÖÔ²¹ìµÀÊÇÏàͬµÄ | |
D£® | ²»Í¬ÐÐÐÇÈÆÌ«ÑôÔ˶¯µÄÍÖÔ²¹ìµÀµÄ°ë³¤ÖáÊÇÏàͬµÄ |
A£® | Ðü¹ÒÔÚÊúÖ±Éþ×ÓÉϵÄÎïÌ壬Éþ×Ó¶ÔËüµÄÀÁ¦Ò»¶¨µÈÓÚÆäÖØÁ¦ | |
B£® | ¾²Ö¹ÔÚˮƽÃæÉϵÄÎïÌå¶ÔˮƽÃæµÄѹÁ¦Ò»¶¨µÈÓÚÆäÖØÁ¦ | |
C£® | ×ÔÓÉÂäÌåÔ˶¯µÄÎïÌåÒÀÈ»Êܵ½ÖØÁ¦×÷Óà | |
D£® | ÎïÌåÏòÉÏÔ˶¯ËùÊÜÖØÁ¦¿ÉÄÜСÓÚÎïÌåÏòÏÂÔ˶¯ËùÊÜÖØÁ¦ |
A£® | 1£º2$\sqrt{2}$ | B£® | 2£º3$\sqrt{2}$ | C£® | 1£º3$\sqrt{3}$ | D£® | 2£º3$\sqrt{3}$ |
A£® | ¼×²¨ÖеÄP´¦Öʵã±ÈM´¦ÖʵãÏÈ»ØƽºâλÖà | |
B£® | ´ÓͼʾµÄʱ¿Ì¿ªÊ¼£¬¾¹ý1.0s£¬PÖʵãͨ¹ýµÄ·³ÌΪ20cm | |
C£® | ´Ëʱ¿Ì£¬MµãµÄÔ˶¯·½ÏòÑØxÖáÕý·½Ïò | |
D£® | ´ÓͼʾµÄʱ¿Ì¿ªÊ¼£¬P´¦Öʵã±ÈQ´¦ÖʵãÏÈ»ØƽºâλÖà |