如图,已知椭圆\(C\):\( \dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{b^{2}}=1(a > b > 0)\)过点\((1\;,\; \dfrac {3}{2})\),两个焦点为\(F_{1}(-1,0)\)和\(F_{2}(1,0).\)圆\(O\)的方程为\(x^{2}+y^{2}=a^{2}\).
\((1)\)求椭圆\(C\)的标准方程;
\((2)\)过\(F_{1}\)且斜率为\(k(k > 0)\)的动直线\(l\)与椭圆\(C\)交于\(A\)、\(B\)两点,与圆\(O\)交于\(P\)、\(Q\)两点\((\)点\(A\)、\(P\)在\(x\)轴上方\()\),当\(|AF_{2}|\),\(|BF_{2}|\),\(|AB|\)成等差数列时,求弦\(PQ\)的长.