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【单选题】
弹簧上端固定,下端挂一只条形磁铁,使磁铁上下振动,磁铁的振动幅度不变.若在振动过程中把带铁芯的线圈靠近磁铁,如图 10 所示,观察磁铁的振幅将会发现 ( )A.
． S 闭合时振幅逐渐减小， S 断开时振幅不变
B.
． S 闭合时振幅逐渐增大， S 断开时振幅不变
C.
． S 闭合或断开，振幅变化相同
D.
． S 闭合或断开，振幅都不发生变化
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