3.
已知椭圆\(C:\dfrac{{{y}^{2}}}{{{a}^{2}}}+\dfrac{{{x}^{2}}}{{{b}^{2}}}=1\left( a > b > 0 \right)\)的离心率\(e=\dfrac{\sqrt{3}}{2}\),两焦点分别为\({{F}_{1}},{{F}_{2}}\),右顶点为\(M\),\(\overrightarrow{M{{F}_{1}}}\cdot \overrightarrow{M{{F}_{2}}}=-2\).
\((\)Ⅰ\()\)求椭圆\(C\)的标准方程;
\((\)Ⅱ\()\)设过定点\((-2,0)\)的直线\(l\)与双曲线\(\dfrac{{{x}^{2}}}{4}-{{y}^{2}}=1\)的左支有两个交点,与椭圆\(C\)交于\(A,B\)两点,与圆\(N:{{x}^{2}}+{{(y-3)}^{2}}=4\)交于\(P,Q\)两点,若\(\Delta MAB\)的面积为\(\dfrac{6}{5}\),\(\overrightarrow{AB}=\lambda \overrightarrow{PQ}\),求正数\(\lambda \)的值.