Question

2£®ÈçͼËùʾ£¬Ö±½Ç×ø±êϵÔÚÒ»Õæ¿ÕÇøÓòÀyÖáÓÒ·½ÓÐÒ»´¹Ö±ÓÚ×ø±êϵƽÃæµÄÔÈÇ¿´Å³¡£¬ÔÚxÖáÉϵÄAµãÓÐÒ»ÖÊ×Ó·¢ÉäÆ÷£¬ËüÏòxÖáµÄÕý·½Ïò·¢ÉäËٶȴóСΪv=2.0¡Á10⁶m/sµÄÖÊ×Ó£¬ÖÊ×Ó¾­´Å³¡ÔÚyÖáµÄPµãÉä³ö´Å³¡£¬Éä³ö·½ÏòÓëyÖá·½Ïò³É¦È=60¡ã½Ç£®ÒÑÖªAµãÓëÔ­µãOµÄ¾àÀëΪ10cm£¬ÖÊ×ӵıȺÉΪ$\frac{q}{m}$=1.0¡Á10⁸C/kg£®Çó£º
£¨1£©´Å¸ÐӦǿ¶ÈµÄ´óСºÍ·½Ïò£»
£¨2£©ÖÊ×ÓÔڴų¡ÖÐÔ˶¯µÄʱ¼ä£®

Answer 1

·ÖÎö £¨1£©ÒÑÖª¹ì¼£ÉÏÁ½¸öµãµÄ×ø±ê£¬¸ù¾Ý×óÊÖ¶¨ÔòÅжÏÂåÂ××ÈÁ¦·½Ïò£¬È»ºóÕÒ³öÔ²ÐÄ¡¢»­³ö¹ì¼££¬½áºÏ¼¸ºÎ¹Øϵȷ¶¨°ë¾¶£¬È»ºó¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÁÐʽÇó½â£»
£¨2£©Á£×Ó×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬¸ù¾Ýt=$\frac{¦È}{2¦Ð}T$ÁÐʽÇó½âʱ¼ä£®

½â´ð ½â£º£¨1£©ÉèÖÊ×ÓÔڴų¡ÖÐ×öÔ²Ô˶¯µÄ°ë¾¶Îªr£¬¹ýA¡¢Pµã×÷ËÙ¶ÈvµÄ´¹Ïߣ¬½»µã¼´ÎªÖÊ×ÓÔڴų¡ÖÐ×÷Ô²ÖÜÔ˶¯µÄÔ²ÐÄO₁£®
Óɼ¸ºÎ¹ØϵµÃ¦Á=90¡ã-¦È=30¡ã£¬ËùÒÔ£ºr=2A=20cm
Éè´Å¸ÐӦǿ¶ÈΪB£¬¸ù¾ÝÖÊ×ÓµÄÔ˶¯·½ÏòºÍ×óÊÖ¶¨Ôò£¬¿ÉÅжϴŸÐӦǿ¶ÈµÄ·½ÏòΪ´¹Ö±ÓÚÖ½ÃæÏòÀ
¸ù¾Ý£ºqvB=m$\frac{{v}^{2}}{r}$£¬B=$\frac{mv}{qr}=\frac{2¡Á1{0}^{6}}{1.0¡Á1{0}^{8}¡Á0.2}$=0.1T 
£¨2£©ÉèÖÊ×ÓÔڴų¡ÖÐÔ˶¯µÄʱ¼äΪt£¬ÈçͼËùʾ£¬ÖÊ×ÓÔڴų¡ÖÐת¹ýµÄÔ²ÖܽÇΪ$\frac{7¦Ð}{6}$£¬ÉèÖÊ×ÓÔڴų¡ÖÐÔ˶¯µÄÖÜÆÚΪT
T=$\frac{2¦Ðm}{qB}$
¹Ê$\frac{t}{T}=\frac{\frac{7¦Ð}{6}}{2¦Ð}=\frac{7}{12}$£¬t=$\frac{7¦Ð}{6}¡Á1{0}^{-7}s$     

´ð£º£¨1£©´Å¸ÐӦǿ¶ÈµÄ´óСΪ0.1T£¬·½ÏòΪ´¹Ö±ÓÚÖ½ÃæÏòÀ
£¨2£©ÖÊ×ÓÔڴų¡ÖÐÔ˶¯µÄʱ¼äΪ$\frac{7¦Ð}{6}¡Á1{0}^{-7}s$£®

µãÆÀ ±¾Ìâ¹Ø¼üÊÇÃ÷È·Á£×ÓµÄÔ˶¯ÐÔÖÊ£¬È»ºó½áºÏÅ£¶ÙµÚ¶þ¶¨ÂɺÍÏòÐÄÁ¦¡¢ÂåÂ××ÈÁ¦¹«Ê½ÁÐʽÇó½âÇó½â£¬»ù´¡ÌâÄ¿£®