ÌâÄ¿ÄÚÈÝ
£¨2008?¸£ÖÝÄ£Ä⣩ÈçͼËùʾ£¬Á½ÌõƽÐеÄ×ã¹»³¤µÄ¹â»¬½ðÊôµ¼¹ìÓëˮƽÃæ³É¦Á=37¡ã½Ç£¬µ¼¹ì¼ä¾àÀëL=0.6m£¬ÆäÉ϶˽ÓÒ»µçÈݺÍÒ»¹Ì¶¨µç×裬µçÈÝC=10¦ÌF£¬¹Ì¶¨µç×èR=4.5¦¸£®µ¼Ìå°ôabÓëµ¼¹ì´¹Ö±ÇÒˮƽ£¬ÆäÖÊÁ¿m=3¡Á10-2kg£¬µç×èr=0.5¦¸£®Õû¸ö×°Öô¦ÓÚ´¹Ö±µ¼¹ìƽÃæÏòÉϵÄÔÈÇ¿´Å³¡ÖУ¬ÒÑÖª´Å¸ÐӦǿ¶ÈB=0.5T£¬È¡g=10m/s2£¬sin37¡ã=0.8£¬cos37¡ã=0.6£®ÏÖ½«ab°ôÓɾ²Ö¹ÊÍ·Å£¬µ±ËüÏ»¬µÄËٶȴﵽÎȶ¨Ê±£¬Çó£º
£¨1£©´Ëʱͨ¹ýab°ôµÄµçÁ÷£»
£¨2£©ab°ôµÄËٶȴóС£»
£¨3£©µçÈÝCÓëa¶ËÏàÁ¬µÄ¼«°åËù´øµÄµçºÉÁ¿£®
£¨1£©´Ëʱͨ¹ýab°ôµÄµçÁ÷£»
£¨2£©ab°ôµÄËٶȴóС£»
£¨3£©µçÈÝCÓëa¶ËÏàÁ¬µÄ¼«°åËù´øµÄµçºÉÁ¿£®
·ÖÎö£º£¨1£©ab°ôÔÈËÙÔ˶¯Ê±£¬´ïµ½Îȶ¨Ëٶȣ¬ÓÉƽºâÌõ¼þºÍ°²ÅàÁ¦¹«Ê½Çó½âµç·ÖеĵçÁ÷£»
£¨2£©Îȶ¨Ê±£¬¸ù¾Ý±ÕºÏµç·ŷķ¶¨ÂÉE=I£¨R+r£©Çó³öµç·Öеĵ綯ÊÆ£¬´Ëµç¶¯ÊÆÊÇab°ôÇиî´Å¸ÐÏß²úÉúµÄ£¬¹ÊE=BLv£¬ÓÉ´Ë¿ÉÒÔÇóµÃab°ôµÄËٶȴóС£»
£¨3£©µçÈÝCÁ½¶ËµÄµçѹµÈÓÚRÁ½¶ËµÄµçѹ£¬¸ù¾ÝµçÈݵĶ¨ÒåʽQ=CU¼ÆËãµçÈÝÆ÷CËù´øµÄµçºÉÁ¿£®
£¨2£©Îȶ¨Ê±£¬¸ù¾Ý±ÕºÏµç·ŷķ¶¨ÂÉE=I£¨R+r£©Çó³öµç·Öеĵ綯ÊÆ£¬´Ëµç¶¯ÊÆÊÇab°ôÇиî´Å¸ÐÏß²úÉúµÄ£¬¹ÊE=BLv£¬ÓÉ´Ë¿ÉÒÔÇóµÃab°ôµÄËٶȴóС£»
£¨3£©µçÈÝCÁ½¶ËµÄµçѹµÈÓÚRÁ½¶ËµÄµçѹ£¬¸ù¾ÝµçÈݵĶ¨ÒåʽQ=CU¼ÆËãµçÈÝÆ÷CËù´øµÄµçºÉÁ¿£®
½â´ð£º½â£º£¨1£©ab°ôÊÜÑØбÃæÏòÉϵݲÅàÁ¦F=BIL£¬Îȶ¨Ê±ÒÔËÙ¶ÈvÔÈËÙÏ»¬£®
´Ëʱab°ôÊÜÁ¦Æ½ºâÓÐ BIL=mg sin 37¡ã
½âµÃ I=
=
A=0.60A
£¨2£©±ÕºÏµç·ÓÐ E=I£¨R+r£©=0.60¡Á£¨4.5+0.5£©V=3V????
ÔÙÓÉab°ôÏ»¬²úÉú¸ÐÓ¦µç¶¯ÊÆE=BLv
½âµÃ v=
=
m/s=10m/s
£¨3£©ÓɸÐÓ¦µçÁ÷·½ÏòÅж¨µçÈÝCÓëa¶ËÏàÁ¬µÄ¼«°å´øÕýµçºÉ£¬µçÈÝCÁ½¶ËµÄµçѹµÈÓÚRÁ½¶ËµÄµçѹ£®
ËùÒÔµçºÉÁ¿Q=CUR=CIR¨T10¡Á10-6¡Á0.60¡Á4.5C=2.7¡Á10-5C
´ð£º£¨1£©´Ëʱͨ¹ýab°ôµÄµçÁ÷Ϊ0.6A£»
£¨2£©ab°ôµÄËٶȴóСΪ10m/s£»
£¨3£©µçÈÝCÓëa¶ËÏàÁ¬µÄ¼«°åËù´øµÄµçºÉÁ¿Îª2.7¡Á10-5C£®
´Ëʱab°ôÊÜÁ¦Æ½ºâÓÐ BIL=mg sin 37¡ã
½âµÃ I=
mgsin37¡ã |
BL |
3¡Á10-2¡Á10¡Á0.8 |
0.5¡Á0.6 |
£¨2£©±ÕºÏµç·ÓÐ E=I£¨R+r£©=0.60¡Á£¨4.5+0.5£©V=3V????
ÔÙÓÉab°ôÏ»¬²úÉú¸ÐÓ¦µç¶¯ÊÆE=BLv
½âµÃ v=
E |
BL |
3 |
0.5¡Á0.6 |
£¨3£©ÓɸÐÓ¦µçÁ÷·½ÏòÅж¨µçÈÝCÓëa¶ËÏàÁ¬µÄ¼«°å´øÕýµçºÉ£¬µçÈÝCÁ½¶ËµÄµçѹµÈÓÚRÁ½¶ËµÄµçѹ£®
ËùÒÔµçºÉÁ¿Q=CUR=CIR¨T10¡Á10-6¡Á0.60¡Á4.5C=2.7¡Á10-5C
´ð£º£¨1£©´Ëʱͨ¹ýab°ôµÄµçÁ÷Ϊ0.6A£»
£¨2£©ab°ôµÄËٶȴóСΪ10m/s£»
£¨3£©µçÈÝCÓëa¶ËÏàÁ¬µÄ¼«°åËù´øµÄµçºÉÁ¿Îª2.7¡Á10-5C£®
µãÆÀ£º±¾ÌâµÄÄѵãÊÇҪעÒâµçÈÝÆ÷Á½¶ËµÄµçѹ²»Êǵ¼Ìå°ô²úÉúµÄµç¶¯ÊÆ£¬¶øÊǵÈÓÚµç×èRÁ½¶ËµÄµçѹ£¬µ¼Ìå°ôÏ൱ÓÚµçÔ´£¬Ôòab°ôÁ½¶ËµÄµçѹÏàµÈÓÚ·¶Ëµçѹ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿