本题目来源于试卷: magnet and magnetic field lines，类别为 美国物理杯赛(Physics Bowl)
[单选题]
17.33: Two long wires are fixed in s szgzs55z *led4 hci5l,u2;pd ,os,bp p agx9y t:zt7 1jace so that the conventional current in the left wire (2 A) comes out t197xt:yg jz a of the plane of the page and the conventional current in the right wire (3 A) goes into the plane of the page. In which Region(s) is there a place on the x-axis (aside from infinity) at which the magnetic field is equal to zero from these currents?
A. Only in Region I
B. In both Regions I and II
C. Only in Region II
D. In both Regions I and III
E. In both Regions II and IIID. electric field strength divided by magnetic field strength
F. charge divided by mass
参考答案: A
本题详细解析:
暂无
| 
