全国大联考·2023届高三第四次联考[4LK·Y]数学试卷答案(更新中)

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15.解：(1)带电粒子在区域I内沿直线运动，且机械能守恒，因此电场力一定垂直于运动方向，如图甲所示工数大根据题意可知=45°，故E9下ngsin日(2分)T六有证变节出工反京年立保命解得E,一②m,方向与：轴正向成45角斜向右上方，(2分)2q以当梁梁部中负，号(2)带电粒子在区城Ⅱ内做圆周运动，因此E:q=mg(2分)解得B=m坚，方向沿y轴正方向。(2分)g电岁明个《3)带电粒子在区域I内运动，根据机被能守恒有mg气之m(2分)解得带电粒子达到N点的速度大小v=√2g(1分)带电粒子在区域Ⅱ内的运动轨迹如图乙所示根据洛伦数力提供向心力有9B=m(2分)根据几何关系可知r=√21(1分)得B=√任(1分)Z

第二节【参考范文】Surprisingly,I felt a little better after the shouting.After a short silence,Eric replied in a firm voice,"I always rememberwhat you said when I was in trouble.You said 'No one can get you out of trouble but yourself.'"Hearing that,I was speechlessand struck by the fact that it was easier to convince others than to convince myself.Inspired by Eric's words,I started searchingfor magazines the next day and finally found one that accepted online contributions with various topics.Then I began to preparemy application form.On finishing the application form I sent it to the editor.Luckily,two days later I received a positive response and aninvitation to write.At first,I only wrote articles I was expert in.Gradually,I began trying new types.One day,much to myamazement,one of my articles appeared on the first page of the magazine!Since then,I have been on my way to becoming anexcellent writer.That definitely should be credited to Eric.It was he who enlightened me and helped me regain confidence toface challenges in my life.的D穷