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範例:電荷在電,磁場中的運動[88日大]

如圖所示，一束帶電荷+q的正離子受到電位差V加速後，進入一相互垂直的電場及磁場中，電場為均勻向下，磁場則為均勻射入紙面。如正離子通過電磁場後有點向下偏斜，欲使正離子沿水平方向筆直通過電磁場，則下列作法何者為正確?(A)適當的減小磁場的量值(B)適當的減小電場的量值(C)適當的增大加速電壓V的量值(D)適當增強電場同時減小加速電壓V的量值(E)適當的將電場及磁場的量值等比例增大。[88日大]


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Posted in 歷屆物理考題, 運動電荷在磁場中的運動.

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By admin – 2010 年 03 月 23 日

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