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【单选题】
下列关于磁力线的描述,正确的是 ( ) (1) 条形磁铁的磁力线是从N 极到 S 极 (2) 条形磁铁的磁力线在磁铁内部是从 S 极到 N 极 (3) 磁力线是从 N 极出发,终止在 S 极的曲线 (4) 磁力线是无头无尾的闭合曲线A.
(2)(4)
B.
(3)(4)
C.
(2)(3)
D.
(1)(2)
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