Question

(20·Ö)Ò»°ë¾¶R=0.6mµÄ½ðÊôԲͲÓÐһȦϸխ·ì£¬ÐÎ×´ÈçͼËùʾ¡£Ô²Í²ÓÒ²àÓëÒ»¸ö´¹Ö±Ö½ÃæÏòÀïµÄÓнçÔÈÇ¿´Å³¡ÏàÇÐÓÚP£¬Ô²Í²½ÓµØ£¬Ô²ÐÄO´¦½ÓÕý¼«£¬Õý¼«ÓëԲͲ֮¼äµÄµç³¡ÀàËÆÓÚÕýµãµçºÉµÄµç³¡£¬Õý¼«ÓëԲͲ֮¼äµçÊƲîU¿Éµ÷¡£Õý¼«¸½½ü·ÅÓÐÒ»Á£×ÓÔ´£¨Á£×ÓÔ´ÓëÕý¼«O¼ä¾àÀëºöÂÔ²»¼Æ£©ÄÜÑØÖ½ÃæÏòËÄÖÜÊͷűȺÉq/m=1.5¡Ál0⁵C/kgµÄ´øÕýµçÁ£×Ó£¨Á£×ӵijõËٶȡ¢ÖØÁ¦¾ù²»¼Æ£©¡£´øµçÁ£×Ó¾­µç³¡¼ÓËÙºó´Ó·ìÖÐÉä³ö½øÈë´Å³¡£¬ÒÑÖª´Å³¡¿í¶Èd=0.4m£¬´Å¸ÐӦǿ¶ÈB=0.25T¡£

£¨1£©ÈôU=750V£¬Ç󣺢ÙÁ£×Ӵﵽϸ·ì´¦µÄËٶȣ»¢ÚÈôÓÐÒ»Á£×ÓÔڴų¡ÖÐÔ˶¯µÄʱ¼ä×î¶Ì£¬Çó´ËÁ£×ӷɳö´Å³¡Ê±ÓëÓұ߽çµÄ¼Ð½Ç´óС¡£
£¨2£©Ö»ÒªµçÊƲîUÔÚºÏÊʵķ¶Î§Äڱ仯£¬×ÜÓдÓÏòÑØijһ·½ÏòÉä³öÁ£×Ó¾­¹ý´Å³¡ºóÓֻص½O´¦£¬ÇóµçÊƲîUºÏÊʵķ¶Î§¡£

Answer 1

£¨1£©¢Ù¢Ú60⁰£»£¨2£©

ÊÔÌâ·ÖÎö£º£¨1£©¢ÙÈôU=750V£¬Á£×Ó¾­µç³¡µÃ
              £¨2·Ö£©
 £¨1·Ö£©
¢ÚÁ£×ÓÔڴų¡ÖÐ×öÔÈËÙÔ²ÖÜÔ˶¯µÃ £¨2·Ö£©
               £¨1·Ö£©

Á£×ÓÔڴų¡ÖÐÔ˶¯¹ì¼£¶ÔÓ¦µÄÏÒ³¤L=d=0.4mʱÔ˶¯µÄʱ¼ä×î¶Ì£¬£¨2·Ö£© 
ÔòÁ£×ӷɳö´Å³¡Ê±ÓëÓұ߽çµÄ¼Ð½Ç´óС         £¨2·Ö£©

£¨2£©Á£×ÓÉäÈë´Å³¡ºóÓëÓұ߽çÏàÇÐʱ£¬Õý¼«ÓëԲͲ֮¼äµçÊƲî×î´óΪ£¬Óɼ¸ºÎ¹ØϵµÃ
  £¨2·Ö£©
µÃ £¬       £¨1·Ö£©
Á£×ÓÔڴų¡ÖР        £¨2·Ö£©
          £¨1·Ö£©
Á£×Ó¾­µç³¡ÖР                £¨2·Ö£©
               £¨1·Ö£©
µçÊƲîUºÏÊʵķ¶Î§:          £¨1·Ö£©