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【单选题】
长为l的单层密绕螺线管,共绕有N匝导线,螺线管的自感为L,下列那种说法是错误的?A.
将螺线管的半径增大一倍，自感为原来的四倍；
B.
换用直径比原来导线直径大一倍的导线密绕，自感为原来的四分之一
C.
在原来密绕的情况下，用同样直径的导线再顺序密绕一层，自感为原来的二倍
D.
在原来密绕的情况下，用同样直径的导线再反方向密绕一层，自感为零。
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A.
正确
B.
错误
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正确
B.
错误
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B.
错误
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A.
正确
B.
错误
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