ÌâÄ¿ÄÚÈÝ
8£®ÈçͼËùʾ£¬ÓôÖϸ¾ùÔȵÄ͵¼ÏßÖƳɰ뾶ΪrµÄÔ²»·£¬PQΪԲ»·µÄÖ±¾¶£¬Æä×óÓÒÁ½²à´æÔÚ´¹Ö±Ô²»·ËùÔÚƽÃæµÄÔÈÇ¿´Å³¡£¬´Å¸ÐӦǿ¶È´óС¾ùΪB£¬µ«·½ÏòÏà·´£¬Ô²»·µÄµç×èΪ2R£®Ò»¸ù³¤¶ÈΪ2r¡¢µç×èΪRµÄ½ðÊô°ôMNÈÆ×ÅÔ²»·µÄÔ²ÐÄOµã½ôÌù×ÅÔ²»·ÒÔ½ÇËٶȦØÑØ˳ʱÕë·½ÏòÔÈËÙת¶¯£¬×ª¶¯¹ý³ÌÖнðÊô°ôMNÓëÔ²»·Ê¼ÖÕ½Ó´¥Á¼ºÃ£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | ½ðÊô°ôMNÁ½¶ËµÄµçѹ´óСΪ$\frac{1}{3}$B¦Ør2 | |
B£® | Ô²»·ÏûºÄµÄµç¹¦ÂÊÊDZ仯µÄ | |
C£® | ½ðÊô°ôMNÖеĵçÁ÷µÄ´óСΪ2$\frac{B¦Ø{r}^{2}}{3R}$ | |
D£® | ½ðÊô°ôMNתÖÁͼʾλÖÃʱNµãµÄµçÊƸßÓÚMµãµÄµçÊÆ |
·ÖÎö ÓÉ·¨ÀµÚµç´Å¸ÐÓ¦¶¨ÂÉÀ´È·¶¨¸ÐÓ¦µç¶¯ÊÆ£¬¼´ÎªÁ½ÖÖ¸ÐÓ¦µç¶¯ÊÆÖ®ºÍ£» ²¢Óɱպϵç·ŷķ¶¨ÂÉÀ´¼ÆËã¸ÐÓ¦µçÁ÷´óС£¬¼Ì¶ø¿É¼ÆËã³öMNÁ½¶ËµÄµçѹ´óС£¨Â·¶Ëµçѹ£©£»¸ù¾Ý¸ÐÓ¦µçÁ÷ÊÇ·ñ±ä»¯À´ÅжÏÔ²»·ÏûºÄµÄ¹¦ÂÊÊÇ·ñ±ä»¯£¬¸ù¾ÝÓÒÊÖ¶¨ÔòÀ´È·¶¨¸ÐÓ¦µçÁ÷µÄ·½Ïò£¬´Ó¶øµÃÖªMNµçÊƵĸߵͣ®
½â´ð ½â£ºA¡¢OMºÍONÁ½¶ÎÏ൱ÓÚÁ½¸öµçÔ´´®Áª£¬ËùÒÔ£¬MN²úÉúµÄ¸ÐÓ¦µç¶¯ÊÆΪ£ºE=2¡Á$\frac{1}{2}$B¦Ør2=B¦Ør2£¬MN°ÑÔ²»··Ö³ÉÁ½µÈ·ÝÇÒ²¢Áª£¨Ã¿·ÝµÄµç×èΪR£©£¬²¢ÁªºóµÄµç×èΪ$\frac{R}{2}$£¬Óɱպϵç·µÄÅ·Ä·¶¨ÂÉÓУºI=$\frac{E}{R+\frac{R}{2}}$=$\frac{2B¦Ø{r}^{2}}{3R}$£¬Ôò½ðÊô°ôMNÁ½¶ËµÄµçѹ£¨Â·¶Ëµçѹ£©´óСΪU=I¡Á$\frac{1}{2}R$=$\frac{1}{3}$B¦Ør2£¬¹ÊAÕýÈ·
B¡¢ÓÉAµÄ·ÖÎö¿ÉÖª£¬Á÷¹ý»·µÄµçÁ÷²»±ä£¬Ôò»·ÏûºÄµÄµç¹¦Âʲ»±ä£¬¹ÊB´íÎó
C¡¢ÓɶÔACµÄ½â´ð¿ÉÖª£¬µç·µÄ×ܵçÁ÷Ϊ£ºI=$\frac{2B¦Ø{r}^{2}}{3R}$£¬ËùÒÔÁ÷¹ý»·µÄµçÁ÷Ϊ£ºI¡ä=$\frac{1}{2}$I=$\frac{B¦Ø{r}^{2}}{3R}$£¬¹ÊC´íÎó£®
D¡¢Òò½ðÊô°ôÊÇÄæʱÕëÐýת£¬ÔÚͼʾλÖÃʱ£¬ÓÉÓÒÊÖ¶¨Ôò¿ÉÖª£¬MO¶ÎOµãµØÊƸߣ¬NO¶Î£¬NµãµçÊƸߣ¬ËùÒÔ½ðÊô°ôMNתÖÁͼʾλÖÃʱNµãµÄµçÊƸßÓÚMµãµÄµçÊÆ£¬¹ÊDÕýÈ·
¹ÊÑ¡£ºAD
µãÆÀ ¸ÃÌâÔÚÇó½âµç¶¯ÊÆʱÀûÓÃÁ˵ÈЧËٶȵÄ˼Ï룬¸ËÔÚ×öÔ²ÖÜÔ˶¯Ê±£¬¸ËÇиî´Å¸ÐÏߵĵÈЧËÙ¶ÈΪ¸ËµÄÖеãµÄËٶȣ»Í¬Ê±½â´ð¸ÃÌ⣬ҪÃ÷È·¸÷²¿·ÖµÄÁ¬½Ó·½Ê½£¬¸Ë·Ö³ÉÁËÁ½¸ö°ë¾¶£¬Ï൱ÓÚÁ½¸öµçÔ´´®Áª£¬MN°ÑÔ²»·Æ½¾ù·Ö³ÉÁËÁ½²¿·Ö£¬ÕâÁ½²¿·ÖÊDz¢ÁªµÄ¹Øϵ£¬ÀíÇåÕâЩ¹Øϵºó£¬½â´ð¸ÃÌâ¾Í±äµÃ¼òµ¥ÁË£®
A£® | ÊDZäËÙÇúÏßÔ˶¯ | B£® | ÊÇÔȱäËÙÔ˶¯ | ||
C£® | ÊÇÏßËٶȲ»±äµÄÔ˶¯ | D£® | ÊÇËÙÂʲ»±äµÄÔ˶¯ |
A£® | ËٶȲ»±ä | B£® | ËٶȲ»¶Ï±ä»¯ | ||
C£® | ¼ÓËٶȴóС²»±ä | D£® | ¼ÓËٶȴóС²»¶Ï±ä»¯ |
A£® | º¤Àë×Ó£¨He+£©´Ón=4Äܼ¶Ô¾Ç¨µ½n=3Äܼ¶±È´Ón=3Äܼ¶Ô¾Ç¨µ½n=2Äܼ¶·øÉä³ö¹â×ÓµÄƵÂÊµÍ | |
B£® | ´óÁ¿´¦ÔÚn=3Äܼ¶µÄº¤Àë×Ó£¨He+£©ÏòµÍÄܼ¶Ô¾Ç¨£¬Ö»ÄÜ·¢³ö2ÖÖ²» ͬƵÂʵĹâ×Ó | |
C£® | º¤Àë×Ó£¨He+£©´Ón=4Äܼ¶Ô¾Ç¨µ½n=3Äܼ¶Ê±·øÉä³öµÄ¹â×ÓÄÜʹÒݳö¹¦Îª2.55eVµÄ½ðÊô·¢Éú¹âµçЧӦ | |
D£® | º¤Àë×Ó£¨He+£©´¦ÓÚn=1Äܼ¶Ê±£¬ÄÜÎüÊÕ45eVµÄÄÜÁ¿Ô¾Ç¨µ½n=2Äܼ¶£¬¶àÓàµÄÄÜÁ¿ÒÔ¹â×ÓÐÎʽ·Å³ö |
A£® | ͨ¹ýµç×è R µÄµçÁ÷·½ÏòΪ P¡úR¡úM | B£® | a¡¢b Á½µã¼äµÄµçѹΪ BLv | ||
C£® | a ¶ËµçÊÆ±È b ¶Ë¸ß | D£® | a ¶ËµçÊÆ±È b ¶ËµÍ |
A£® | ÎïÌåµÄ³õʼ¸ß¶ÈºÍËùÊÜÖØÁ¦ | |
B£® | ÎïÌåµÄ³õʼ¸ß¶ÈºÍ³õËÙ¶È | |
C£® | ÎïÌåËùÊܵÄÖØÁ¦ºÍ³õËÙ¶È | |
D£® | ÎïÌåËùÊܵÄÖØÁ¦¡¢³õʼ¸ß¶ÈºÍ³õËÙ¶È |
A£® | µçѹµÄÓÐЧֵΪ10V | B£® | ͨ¹ýµç×èµÄµçÁ÷ÓÐЧֵΪ1A | ||
C£® | µç×èÿÃëÖÖ²úÉúµÄÈÈÁ¿Îª10J | D£® | µç×èÏûºÄµç¹¦ÂÊΪ5W |
A£® | µçÔ´Á½¶ËµÄµçѹΪ8V | B£® | µçÔ´Êä³öµÄµç¹¦ÂÊΪ20W | ||
C£® | µç¶¯»úÁ½¶ËµÄµçѹΪ7.0V | D£® | µç¶¯»úµÄÊä³ö¹¦ÂÊΪ12W |