Concentric circles $\Omega_1$ and $\Omega_2$ with radii $1$ and $100$, respectively, are drawn with center $O$. Points $A$ and $B$ are chosen independently at random on the circumferences of $\Omega_1$ and $\Omega_2$, respectively. Denote by $\ell$ the tangent line to $\Omega_1$ passing through $A$, and denote by $P$ the reflection of $B$ across $\ell$. Compute the expected value of $OP^2$.

[i]Proposed by Lewis Chen[/i]
1. **Define the problem setup:**
   - We have two concentric circles $\Omega_1$ and $\Omega_2$ with radii $1$ and $100$, respectively, centered at $O$.
   - Points $A$ and $B$ are chosen independently at random on the circumferences of $\Omega_1$ and $\Omega_2$, respectively.
   - $\ell$ is the tangent line to $\Omega_1$ at point $A$.
   - $P$ is the reflection of $B$ across $\ell$.
   - We need to compute the expected value of $OP^2$.

2. **Parameterize the points:**
   - Let $A$ be at $(\cos \theta, \sin \theta)$ on $\Omega_1$.
   - Let $B$ be at $(100 \cos \phi, 100 \sin \phi)$ on $\Omega_2$.

3. **Find the equation of the tangent line $\ell$ at $A$:**
   - The tangent line at $A = (\cos \theta, \sin \theta)$ to $\Omega_1$ has the equation:
     \[
     \cos \theta (x - \cos \theta) + \sin \theta (y - \sin \theta) = 0
     \]
     Simplifying, we get:
     \[
     \cos \theta x + \sin \theta y = 1
     \]

4. **Reflect point $B$ across $\ell$:**
   - The reflection of a point $(x_1, y_1)$ across the line $ax + by + c = 0$ is given by:
     \[
     \left( x_1 - \frac{2a(ax_1 + by_1 + c)}{a^2 + b^2}, y_1 - \frac{2b(ax_1 + by_1 + c)}{a^2 + b^2} \right)
     \]
   - Here, $a = \cos \theta$, $b = \sin \theta$, and $c = -1$.
   - For $B = (100 \cos \phi, 100 \sin \phi)$, we have:
     \[
     P = \left( 100 \cos \phi - \frac{2 \cos \theta (\cos \theta (100 \cos \phi) + \sin \theta (100 \sin \phi) - 1)}{\cos^2 \theta + \sin^2 \theta}, 100 \sin \phi - \frac{2 \sin \theta (\cos \theta (100 \cos \phi) + \sin \theta (100 \sin \phi) - 1)}{\cos^2 \theta + \sin^2 \theta} \right)
     \]
   - Since $\cos^2 \theta + \sin^2 \theta = 1$, this simplifies to:
     \[
     P = \left( 100 \cos \phi - 2 \cos \theta (\cos \theta (100 \cos \phi) + \sin \theta (100 \sin \phi) - 1), 100 \sin \phi - 2 \sin \theta (\cos \theta (100 \cos \phi) + \sin \theta (100 \sin \phi) - 1) \right)
     \]
   - Further simplifying, we get:
     \[
     P = \left( 100 \cos \phi - 2 \cos \theta (100 \cos \theta \cos \phi + 100 \sin \theta \sin \phi - 1), 100 \sin \phi - 2 \sin \theta (100 \cos \theta \cos \phi + 100 \sin \theta \sin \phi - 1) \right)
     \]
     \[
     P = \left( 100 \cos \phi - 200 \cos \theta \cos \phi - 200 \sin \theta \sin \phi + 2 \cos \theta, 100 \sin \phi - 200 \sin \theta \cos \phi - 200 \sin \theta \sin \phi + 2 \sin \theta \right)
     \]
     \[
     P = \left( -100 \cos \phi + 2 \cos \theta, -100 \sin \phi + 2 \sin \theta \right)
     \]

5. **Calculate $OP^2$:**
   - $OP^2 = (-100 \cos \phi + 2 \cos \theta)^2 + (-100 \sin \phi + 2 \sin \theta)^2$
   - Expanding and simplifying:
     \[
     OP^2 = (100 \cos \phi - 2 \cos \theta)^2 + (100 \sin \phi - 2 \sin \theta)^2
     \]
     \[
     OP^2 = 10000 \cos^2 \phi - 400 \cos \phi \cos \theta + 4 \cos^2 \theta + 10000 \sin^2 \phi - 400 \sin \phi \sin \theta + 4 \sin^2 \theta
     \]
     \[
     OP^2 = 10000 (\cos^2 \phi + \sin^2 \phi) - 400 (\cos \phi \cos \theta + \sin \phi \sin \theta) + 4 (\cos^2 \theta + \sin^2 \theta)
     \]
     \[
     OP^2 = 10000 - 400 (\cos \phi \cos \theta + \sin \phi \sin \theta) + 4
     \]
     \[
     OP^2 = 10004 - 400 (\cos \phi \cos \theta + \sin \phi \sin \theta)
     \]

6. **Expected value of $OP^2$:**
   - Since $\cos \phi \cos \theta + \sin \phi \sin \theta = \cos (\phi - \theta)$, and the expected value of $\cos (\phi - \theta)$ over a uniform distribution is $0$:
     \[
     \mathbb{E}[OP^2] = 10004 - 400 \cdot 0 = 10004
     \]

The final answer is $\boxed{10004}$.