一道初二物理题(关于电阻的)将一根电阻线对折后,它的电阻值变为原来的1/4.为什么?首先,请原谅我的理解能力,折成两半?(那样长度应该不变的吧)还是剪成两半?(剪成两半之后它的横截
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![一道初二物理题(关于电阻的)将一根电阻线对折后,它的电阻值变为原来的1/4.为什么?首先,请原谅我的理解能力,折成两半?(那样长度应该不变的吧)还是剪成两半?(剪成两半之后它的横截](/uploads/image/z/1027429-61-9.jpg?t=%E4%B8%80%E9%81%93%E5%88%9D%E4%BA%8C%E7%89%A9%E7%90%86%E9%A2%98%EF%BC%88%E5%85%B3%E4%BA%8E%E7%94%B5%E9%98%BB%E7%9A%84%EF%BC%89%E5%B0%86%E4%B8%80%E6%A0%B9%E7%94%B5%E9%98%BB%E7%BA%BF%E5%AF%B9%E6%8A%98%E5%90%8E%2C%E5%AE%83%E7%9A%84%E7%94%B5%E9%98%BB%E5%80%BC%E5%8F%98%E4%B8%BA%E5%8E%9F%E6%9D%A5%E7%9A%841%2F4.%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E9%A6%96%E5%85%88%2C%E8%AF%B7%E5%8E%9F%E8%B0%85%E6%88%91%E7%9A%84%E7%90%86%E8%A7%A3%E8%83%BD%E5%8A%9B%2C%E6%8A%98%E6%88%90%E4%B8%A4%E5%8D%8A%3F%EF%BC%88%E9%82%A3%E6%A0%B7%E9%95%BF%E5%BA%A6%E5%BA%94%E8%AF%A5%E4%B8%8D%E5%8F%98%E7%9A%84%E5%90%A7%EF%BC%89%E8%BF%98%E6%98%AF%E5%89%AA%E6%88%90%E4%B8%A4%E5%8D%8A%3F%EF%BC%88%E5%89%AA%E6%88%90%E4%B8%A4%E5%8D%8A%E4%B9%8B%E5%90%8E%E5%AE%83%E7%9A%84%E6%A8%AA%E6%88%AA)
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