请说明理由如图所示,L是电磁铁,在L正上方用弹簧悬挂一条形磁铁,设电源电压不变,闭合电键S待电磁铁稳定后,当滑动变阻器R的滑片由上向下缓缓地滑动过程中,弹簧的长度将A.先变短后变长 B
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![请说明理由如图所示,L是电磁铁,在L正上方用弹簧悬挂一条形磁铁,设电源电压不变,闭合电键S待电磁铁稳定后,当滑动变阻器R的滑片由上向下缓缓地滑动过程中,弹簧的长度将A.先变短后变长 B](/uploads/image/z/5308402-58-2.jpg?t=%E8%AF%B7%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CL%E6%98%AF%E7%94%B5%E7%A3%81%E9%93%81%2C%E5%9C%A8L%E6%AD%A3%E4%B8%8A%E6%96%B9%E7%94%A8%E5%BC%B9%E7%B0%A7%E6%82%AC%E6%8C%82%E4%B8%80%E6%9D%A1%E5%BD%A2%E7%A3%81%E9%93%81%2C%E8%AE%BE%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98%2C%E9%97%AD%E5%90%88%E7%94%B5%E9%94%AES%E5%BE%85%E7%94%B5%E7%A3%81%E9%93%81%E7%A8%B3%E5%AE%9A%E5%90%8E%2C%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8R%E7%9A%84%E6%BB%91%E7%89%87%E7%94%B1%E4%B8%8A%E5%90%91%E4%B8%8B%E7%BC%93%E7%BC%93%E5%9C%B0%E6%BB%91%E5%8A%A8%E8%BF%87%E7%A8%8B%E4%B8%AD%2C%E5%BC%B9%E7%B0%A7%E7%9A%84%E9%95%BF%E5%BA%A6%E5%B0%86A%EF%BC%8E%E5%85%88%E5%8F%98%E7%9F%AD%E5%90%8E%E5%8F%98%E9%95%BF+B)
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