如圖，在平面直角座標系xoy內，第一象限的*線op與x軸夾角為30º，在∠pox範圍之外存在垂直xoy面向裏的...
問題詳情：如圖，在平面直角座標系xoy內，第一象限的*線op與x軸夾角為30º，在∠pox範圍之外存在垂直xoy面向裏的勻強磁場，磁感應強度為B．一質量為m、帶電量為q的正電粒子，從o點以沿y軸負方向的速度v出發僅受磁場力而運動。試求：（1...
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