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【简答题】
在直角坐标坐标系中，已知一个圆心在坐标原点，半径为2的圆，从这个圆上任意一点P向y轴作垂线段PP′，P′为垂足， （1）求线段PP′中点M的轨迹C的方程； （2）过点Q（-2，0）作直线l与曲线C交于A、B两点，设N是过点（ ，0），且以 为方向向量的直线上一动点，满足 （O为坐标原点），问是否存在这样的直线l，使得四边形OANB为矩形？若存在，求出直线l的方程；若不存在，说明理由。
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