Let $E$ be the midpoint of side $[AB]$ of square $ABCD$. Let the circle through $B$ with center $A$ and segment $[EC]$ meet at $F$. What is $|EF|/|FC|$? 

$ 
\textbf{(A)}\ 2
\qquad\textbf{(B)}\ \dfrac{3}{2}
\qquad\textbf{(C)}\ \sqrt{5}-1
\qquad\textbf{(D)}\ 3
\qquad\textbf{(E)}\ \sqrt{3}
$
1. **Assume the side length of the square \(ABCD\) is 2.**
   - This assumption simplifies calculations without loss of generality because the ratio we seek is independent of the side length.

2. **Determine the coordinates of points \(A\), \(B\), \(C\), and \(D\).**
   - Let \(A = (0, 0)\), \(B = (2, 0)\), \(C = (2, 2)\), and \(D = (0, 2)\).

3. **Find the coordinates of the midpoint \(E\) of side \([AB]\).**
   - Since \(E\) is the midpoint of \([AB]\), its coordinates are:
     \[
     E = \left(\frac{0+2}{2}, \frac{0+0}{2}\right) = (1, 0)
     \]

4. **Calculate the length of segment \([EC]\).**
   - Using the distance formula:
     \[
     EC = \sqrt{(2-1)^2 + (2-0)^2} = \sqrt{1 + 4} = \sqrt{5}
     \]

5. **Determine the equation of the circle centered at \(A\) passing through \(B\).**
   - The radius of the circle is the distance from \(A\) to \(B\), which is 2. Thus, the equation of the circle is:
     \[
     x^2 + y^2 = 4
     \]

6. **Find the intersection point \(F\) of the circle and segment \([EC]\).**
   - The parametric equation of line segment \([EC]\) can be written as:
     \[
     (x, y) = (1, 0) + t(1, 2) = (1 + t, 2t)
     \]
     where \(0 \leq t \leq 1\).

7. **Substitute the parametric coordinates into the circle's equation:**
   \[
   (1 + t)^2 + (2t)^2 = 4
   \]
   Simplify and solve for \(t\):
   \[
   (1 + t)^2 + 4t^2 = 4
   \]
   \[
   1 + 2t + t^2 + 4t^2 = 4
   \]
   \[
   5t^2 + 2t + 1 = 4
   \]
   \[
   5t^2 + 2t - 3 = 0
   \]

8. **Solve the quadratic equation:**
   \[
   t = \frac{-2 \pm \sqrt{4 + 60}}{10} = \frac{-2 \pm 8}{10}
   \]
   \[
   t = \frac{6}{10} = 0.6 \quad \text{or} \quad t = \frac{-10}{10} = -1
   \]
   Since \(0 \leq t \leq 1\), we take \(t = 0.6\).

9. **Find the coordinates of \(F\):**
   \[
   F = (1 + 0.6, 2 \cdot 0.6) = (1.6, 1.2)
   \]

10. **Calculate the lengths \(EF\) and \(FC\):**
    - \(EF\):
      \[
      EF = \sqrt{(1.6 - 1)^2 + (1.2 - 0)^2} = \sqrt{0.36 + 1.44} = \sqrt{1.8}
      \]
    - \(FC\):
      \[
      FC = \sqrt{(2 - 1.6)^2 + (2 - 1.2)^2} = \sqrt{0.16 + 0.64} = \sqrt{0.8}
      \]

11. **Calculate the ratio \(\frac{EF}{FC}\):**
    \[
    \frac{EF}{FC} = \frac{\sqrt{1.8}}{\sqrt{0.8}} = \sqrt{\frac{1.8}{0.8}} = \sqrt{2.25} = 1.5
    \]

The final answer is \(\boxed{\frac{3}{2}}\)