問題詳情
58. 帶正電的粒子以初速 v 由地表向正上方拋射，運動區域可加入一垂直於初速的均勻磁場如右圖所示。以下敘述何者正確？
(A) 有加磁場的情況下，粒子運動軌跡為正圓
(B) 有加磁場的情況下，磁力及重力都對粒子作功
(C) 有加磁場的情況下，粒子會落回原地
(D) 沒加磁場時粒子可達到的最高高度比有加磁場時高 
參考答案
無參考答案
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