Question

13£®Ò»µçÁ÷±íµÄÁ¿³Ì±êʾ²»×¼È·£¬Ä³Í¬Ñ§Ïë²âÁ¿¸ÃµçÁ÷±íµÄʵ¼ÊÁ¿³Ì I_m£®ËùÓÃÆ÷²ÄÓУº
A£®´ý²âµçÁ÷±í£¨ÄÚ×è r₁ԼΪ10.0¦¸£¬Á¿³Ì±ê³ÆΪ 5.0mA£©
B£®±ê×¼µçÁ÷±í£¨ÄÚ×è r₂=45.0¦¸£¬Á¿³ÌΪ 1.0mA£©
C£®±ê×¼µç×è R₁£¨×èֵΪ 10.0¦¸£© 
D£®»¬¶¯±ä×èÆ÷ R£¨×î´ó×èֵΪ15.0¦¸£©
E£®µçÔ´E£¨µç¶¯ÊÆΪ3.0V£¬ÄÚ×è²»¼Æ£©
F£®±£»¤µç×è R₂ H£®¿ª¹ØS¡¢µ¼ÏßÈô¸É
£¨1£©ÇëÔÚͼʾµÄʵÎïͼÉÏÍê³ÉÁ¬Ïߣ®
£¨2£©¸ù¾ÝÁ¬ÏßͼÅжϣ¬ÔÚ¿ª¹Ø S±ÕºÏÇ°£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬ PÓ¦»¬¶¯ÖÁa£¨Ìî¡°a¡±»ò¡°b¡±£©¶Ë£®
£¨3£©¿ª¹ØS±ÕºÏºó£¬µ÷½Ú»¬¶¯±ä×èÆ÷»¬Æ¬ËùÔÚµÄλÖã¬Ê¹µçÁ÷±í ÂúÆ«£»Èô´ËʱµçÁ÷±íµÄʾÊýΪI₂£¬ÔòµÄÁ¿³ÌI_m=${\frac{11}{2}I}_{2}^{\;}$£®

Answer 1

·ÖÎö ±¾Ì⣨1£©µÄ¹Ø¼üÊǸù¾Ý´ý²âµçÁ÷±í${A}_{1}^{\;}$µÄÁ¿³ÌÔ¶´óÓÚµçÁ÷±í${A}_{2}^{\;}$µÄÁ¿³Ì£¬Ó¦¿¼Âǽ«${A}_{2}^{\;}$Ó붨ֵµç×è${R}_{1}^{\;}$²¢ÁªÀ´½øÐиÄ×°£¬ÔÙͨ¹ý¼ÆËã¿ÉÐУ»Ì⣨2£©µç¼ü±ÕºÏÇ°Ó¦½«»¬Æ¬ÖÃÓÚµç·ÖеçÁ÷×îСµÄλÖã»Ì⣨3£©¸ù¾ÝÅ·Ä·¶¨ÂÉд³ö´ý²âµçÁ÷±íµÄµçÁ÷±í´ïʽ¼´¿É£®

½â´ð ½â£º£¨1£©£ºÓÉÓÚµçÁ÷±í${A}_{2}^{\;}$µÄÁ¿³ÌԶСÓÚ${A}_{1}^{\;}$µÄÁ¿³Ì£¬¿¼Âǽ«µçÁ÷±í${A}_{2}^{\;}$Ó붨ֵµç×è${R}_{1}^{\;}$²¢ÁªÒÔÀ©´óÁ¿³Ì£º²¢ÁªºóµçÁ÷±í${A}_{2}^{\;}$µÄÁ¿³ÌӦΪ${I}_{2m}^{\;}$=${I}_{2}^{\;}+\frac{{{I}_{2}^{\;}r}_{2}^{\;}}{{R}_{1}^{\;}}$=5.5mA£¬ÓëµçÁ÷±í${A}_{1}^{\;}$µÄÁ¿³Ì½Ó½ü£¬ËùÒԿɽ«¸Ä×°ºóµÄµçÁ÷±íÓëµçÁ÷±í${A}_{1}^{\;}$´®ÁªÒÔÍê³É²âÁ¿£¬ËùÒÔµç·ͼÈçͼËùʾ£º

£¨2£©£ºÎª±£»¤µçÁ÷±í£¬±ÕºÏµç¼üÇ°»¬Æ¬PÓ¦»¬ÖÁ×èÖµ×î´óµÄa¶Ë£»
£¨3£©£º¸ù¾ÝÅ·Ä·¶¨ÂÉÓ¦ÓУº${I}_{m}^{\;}$=${I}_{2}^{\;}+\frac{{{I}_{2}^{\;}r}_{2}^{\;}}{{R}_{1}^{\;}}$£¬
´úÈëÊý¾Ý½âµÃ${I}_{m}^{\;}$=${\frac{11}{2}I}_{2}^{\;}$£»
¹Ê´ð°¸Îª£º£¨1£©Èçͼ£»£¨2£©a£»£¨3£©${\frac{11}{2}I}_{2}^{\;}$

µãÆÀ µ±µç±íµÄÁ¿³Ì̫СʱӦ¿¼ÂǽøÐиÄ×°£¬×¢Òâ´®Áªµç×è¾ßÓзÖѹ×÷Ó㬲¢Áªµç×è¾ßÓзÖÁ÷×÷Óã®