大学物理题库——计算题 - 百度文库

56һһֱΪ2.0cmĽԲͲ,ԲͲߴװһֱΪ1.2710-5 mĽ˿˿ԲͲĵƲΪ1103 V1˿ijǿС2ԲͲڱijǿСδ֣

57ذ뾶AC㣬ͼʾOĴŸӦǿǶ٣

58һ޳Բͭ壨ŵ?0뾶ΪRͨоȷֲĵIȡһƽSΪ2m ΪRλ

2mIͼлб߲ʾͨþƽĴͨע⣺еĿΪ2R

R

59뾶ΪR޳ȴԲ壬ܶΪ?󣺵糡ǿȷֲ͵ƷֲE-rͼߣ

??????????R??????

60ڰ뾶ΪR޳Բڲȥһ뾶Ϊr

d޳Բ壬ԲƽУΪdͼʾеؿԲ߷IȷֲڿĽϡԲϺͿIJϵĴŸӦǿȵĴС(ΪиĴųֲ)

o?Rr?o?

61ųԵӻеӰ졣ٵƲΪ2.0?104ǹľΪ0.2ףԼڴСΪ0.5?10?4˹ĺųԼƫת٣ƫתǷӰͼ˵ԭ

62ͼʾһͨеI1 = 20AԱһֱABΪ9cmͨеI2 = 20A߶ABֱڳI1ֱߣA˵ֱߵľΪ1cmI1I2棬

A1cmBI2

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