ÌâÄ¿ÄÚÈÝ
1£®ÈçͼËùʾ£¬ÖÊÁ¿ÎªMµÄµ¼Ìå°ôab£¬´¹Ö±·ÅÔÚÏà¾àΪLµÄƽÐй⻬½ðÊô¹ìµÀÉÏ£®µ¼¹ìƽÃæÓëˮƽÃæµÄ¼Ð½ÇΪ¦È£¬²¢´¦ÓڴŸÐӦǿ¶È´óСΪB¡¢·½Ïò´¹Ö±Óëµ¼¹ìƽÃæÏòÉϵÄÔÈÇ¿´Å³¡ÖУ¬×ó²àÊÇˮƽ·ÅÖᢼä¾àΪdµÄƽÐнðÊô°å£¬RºÍRx·Ö±ð±íʾ¶¨Öµµç×èºÍ»¬¶¯±ä×èÆ÷µÄ×èÖµ£¬²»¼ÆÆäËûµç×裮£¨1£©µ÷½ÚRx=R£¬Êͷŵ¼Ìå°ô£¬µ±°ôÑص¼¹ìÔÈËÙÏ»¬Ê±£¬Çóͨ¹ý°ôµÄµçÁ÷I¼°°ôµÄËÙÂÊv£®
£¨2£©½ðÊô¸Ëab´ïµ½×î´óËÙÂÊÒԺ󣬵ç×èÆ÷RXÿÃëÄÚ²úÉúµÄµçÈÈ£®
£¨3£©¸Ä±äRx£¬´ý°ôÑص¼¹ìÔÙ´ÎÔÈËÙÏ»¬ºó£¬½«ÖÊÁ¿Îªm¡¢´øµçÁ¿Îª+qµÄ΢Á£Ë®Æ½ÉäÈë½ðÊô°å¼ä£¬ÈôËüÄÜÔÈËÙͨ¹ý£¬Çó´ËʱµÄRx£®
·ÖÎö £¨1£©°ôÔÈËÙÔ˶¯Ê±£¬ÊÜÁ¦Æ½ºâ£®Óɵç´Å¸ÐÓ¦¶¨ÂÉÇóµç¶¯ÊÆE=BLv¡¢±ÕºÏµç·ŷķ¶¨ÂÉÇóµçÁ÷I=$\frac{E}{R+{R}_{x}}$£¬Óɵ¼Ìå°ôÊÜÁ¦Æ½ºâÇóͨ¹ý°ôµÄµçÁ÷I¼°°ôµÄËÙÂÊv£®
£¨2£©¸ù¾Ý½¹¶ú¶¨ÂÉÇóµç×èÆ÷RXÿÃëÄÚ²úÉúµÄµçÈÈ£®
£¨3£©´øµçÁ£×ÓÔÈËÙͨ¹ýµçÈÝÆ÷£¬ÊÜÁ¦Æ½ºâ£¬ÓÉƽºâÌõ¼þ¿ÉµÃµ½°å¼äÇóµçѹ£¬½áºÏ±ÕºÏµç·ŷķ¶¨ÂÉÇó½â£®
½â´ð ½â£º£¨1£©µ¼Ìå°ôÔÈËÙÏ»¬Ê±£¬ÓУºMgsin¦È=BIL¡¢Ù
ÔòµÃ¸ÐÓ¦µçÁ÷Ϊ£ºI=$\frac{Mgsin¦È}{BL}$¡¢Ú
Éèµ¼Ìå°ô²úÉúµÄ¸ÐÓ¦µç¶¯ÊÆΪE0£¬ÔòÓУºE0=BLv¡¢Û
Óɱպϵç·ŷķ¶¨ÂɵãºI=$\frac{{E}_{0}}{R+{R}_{x}}$¡¢Ü
ÓÉÌâÒ⣬Rx=R¡¢Ý
ÁªÁ¢¢Ú¢Û¢Ü¢Ý£¬µÃ£ºv=$\frac{2MgRsin¦È}{{B}^{2}{L}^{2}}$¡¢Þ
£¨2£©½ðÊô¸Ëab´ïµ½×î´óËÙÂÊÒԺ󣬵ç×èÆ÷RXÿÃëÄÚ²úÉúµÄµçÈÈΪ£ºQ=I2Rt=$\frac{{M}^{2}{g}^{2}Rsi{n}^{2}¦È}{{B}^{2}{L}^{2}}$¡¢ß
£¨3£©¸Ä±äRxÓÉ¢Úʽ¿ÉÖªµçÁ÷²»±ä£®Éè´øµç΢Á£ÔÚ½ðÊô°å¼äÔÈËÙͨ¹ýʱ£¬°å¼äµçѹΪU£¬µç³¡Ç¿¶È´óСΪE
Ôò U=IRx ¡¢à
°å¼ä³¡Ç¿Îª£ºE=$\frac{U}{d}$¡¢á
Á£×ÓÊÜÁ¦Æ½ºâ£¬ÔòÓУºmg=qE¡£¨10£©
ÁªÁ¢£¬µÃ£ºRx=$\frac{mBLd}{qMsin¦È}$¡£¨11£©
´ð£º£¨1£©Í¨¹ý°ôµÄµçÁ÷IΪ$\frac{Mgsin¦È}{BL}$£¬°ôµÄËÙÂÊvΪ$\frac{2MgRsin¦È}{{B}^{2}{L}^{2}}$£®
£¨2£©½ðÊô¸Ëab´ïµ½×î´óËÙÂÊÒԺ󣬵ç×èÆ÷RXÿÃëÄÚ²úÉúµÄµçÈÈΪ$\frac{{M}^{2}{g}^{2}Rsi{n}^{2}¦È}{{B}^{2}{L}^{2}}$£®
£¨3£©´ËʱµÄRxΪ$\frac{mBLd}{qMsin¦È}$£®
µãÆÀ ´ËÌ⿼²éÁ˵ç´Å¸ÐÓ¦¶¨ÂÉÓë±ÕºÏµç·ŷķ¶¨ÂɵÄÓ¦Óã¬ÕÆÎÕƽºâÌõ¼þ£¬×¢ÒâÁ£×ÓÔÚ¸´ºÏ³¡ÖÐ×öÔÈËÙÔ˶¯£¬ÊÜÁ¦ÊÇƽºâÌõ¼þµÄ£¬ÓëËÙ¶ÈÑ¡ÔñÆ÷µÄÔÀíÏàËÆ£®
A£® | ¾²Ö¹ | B£® | ±³ÀëÔ²ÐÄ×öÖ±ÏßÔ˶¯ | ||
C£® | ÑØÇÐÏß·½Ïò×öÖ±ÏßÔ˶¯ | D£® | ×öÇúÏßÔ˶¯ |
A£® | ÎÀÐÇÔÚ¹ìµÀ3ÉϵÄËÙÂÊ´óÓÚËüÔÚ¹ìµÀ1ÉϵÄËÙÂÊ | |
B£® | ÎÀÐÇÔÚ¹ìµÀ3ÉϵĽÇËٶȴóÓÚËüÔÚ¹ìµÀ1ÉϵĽÇËÙ¶È | |
C£® | ÎÀÐÇÔÚ¹ìµÀ1ÉϾ¹ýQµãʱµÄËÙÂÊСÓÚËüÔÚ¹ìµÀ2ÉϾ¹ýQµãʱµÄËÙÂÊ | |
D£® | ÎÀÐÇÔÚ¹ìµÀ2ÉϾ¹ýPµãʱµÄ¼ÓËٶȵÈÓÚËüÔÚ¹ìµÀ3ÉϾ¹ýPµãʱµÄ¼ÓËÙ¶È |
A£® | ÈËÏòÓÒÔÈËÙÔ˶¯Ê±£¬ÉþµÄÀÁ¦T´óÓÚÎïÌåµÄÖØÁ¦mg | |
B£® | ÈËÏòÓÒÔÈËÙÔ˶¯Ê±£¬ÉþµÄÀÁ¦TµÈÓÚÎïÌåµÄÖØÁ¦mg | |
C£® | ÎïÌåÏòÉÏÔÈËÙÔ˶¯Ê±£¬È˵ÄÔ˶¯ÊÇÏòÓÒ¼ÓËÙÔ˶¯ | |
D£® | ÎïÌåÏòÉÏÔÈËÙÔ˶¯Ê±£¬È˵ÄÔ˶¯ÊÇÏòÓÒ¼õËÙÔ˶¯ |
A£® | Ħ²ÁÁ¦¶ÔP×ö¹¦Îª¦Ìmgcos¦Á•L£¨1-cos¦Á£© | B£® | Ħ²ÁÁ¦¶ÔP×ö¹¦Îªmgsin¦Á•L£¨1-cos¦Á£© | ||
C£® | Ö§³ÖÁ¦¶ÔP×ö¹¦ÎªmgLsin¦Á | D£® | °å¶ÔP×ö¹¦ÎªmgLsin¦Á |
A£® | AÎïÌå¼ÓËÙÉÏÉý£¬ÉþµÄÀÁ¦´óÓÚAµÄÖØÁ¦ | |
B£® | AÎïÌåÔÈËÙÉÏÉý£¬ÉþµÄÀÁ¦µÈÓÚAµÄÖØÁ¦ | |
C£® | AÎïÌå¼õËÙÉÏÉý£¬ÉþµÄÀÁ¦Ð¡ÓÚAµÄÖØÁ¦ | |
D£® | ÉþµÄÀÁ¦ÏÈ´óÓÚAµÄÖØÁ¦£¬ºó±äΪСÓÚÖØÁ¦ |
A£® | Öʵã³õËÙ¶ÈΪ0 | B£® | ÖʵãµÄ³õËٶȴóСΪ5m/s | ||
C£® | 2sÄ©ÖʵãËٶȴóСΪ5m/s | D£® | ÖʵãËùÊܵĺÏÍâÁ¦´óСΪ3N |