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【单选题】
有两个长直密绕螺线管,长度及线圈匝数均相同,半径分别为 r 1 和 r 2 。充满均匀介质,其磁导率分别为 和 。设 , ,当将两只螺线管串联在电路中通电稳定后,其自感系数之比 L 1 : L 2 与磁能之比 W m 1 : W m 2 分别为A.
L 1 : L 2 = 1:1 ， W m 1 : W m 2 =1:1
B.
L 1 : L 2 = 1:2 ， W m 1 : W m2 = 1:1
C.
L 1 : L 2 = 1:2 ， W m1 : W m 2 =1:2
D.
L 1 : L 2 = 2:1 ， W m 1 : W m2 = 2:1
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