A tangent at a point on the circle \( x^{2}+y^{2}=a^{2} \) intersects a concentric circle \( C \...

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A tangent at a point on the circle \( x^{2}+y^{2}=a^{2} \) intersects a concentric circle \( C \) at two points \( P \) and \( Q \). The tangents to the circle \( C \) at \( P \) and \( Q \) meet at a point on the circle \( x^{2}+y^{2} \) \( =b^{2} \). Then the equation of the circle \( C \) is
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