题目
(本题8分) (2030)将通有电流I = 5.0 A的无限长导线折成如图形状,已知半圆环的半径为R =0.10 m.求圆心O点的磁感强度.(?0 =4?×10-7 H・m-1)I R O
(本题8分) (2030)将通有电流I = 5.0 A的无限长导线折成如图形状,已知半圆环的半径为R =0.10 m.求圆心O点的磁感强度.(?0 =4?×10-7 H・m-1)I R O
题目解答
答案
(本题8分) (2030)解:O处总 B?Bab?Bbc?Bcd,方向垂直指向纸里 1分 而 Bab??0I4?a(si?n2?sin?1)bIaO1∵ ?2?0,?1???,a?R2∴ Bab??0I/(4?R)cd 又 Bbc??0I/(4R)因O在cd延长线上 Bcd?0, 因此 B??0I4?R??0I?2.1×10-5 T 4R