問題詳情

50. Two long straight current-carrying parallel wires cross the x axisand carry currents I and 3I in the same direction, as shown in thefigure. At what value of x is the net magnetic field zero?


(A) 1
(B) 3
(C) 4
(D) 5
(E) 7

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增