Find the largest constant $c>0$ such that for every positive integer $n\ge 2$, there always exist a positive divisor $d$ of $n$ such that $$d\le \sqrt{n}\hspace{0.5cm} \text{and} \hspace{0.5cm} \tau(d)\ge c\sqrt{\tau(n)}$$ where $\tau(n)$ is the number of divisors of $n$. 

[i]Proposed by Mohd. Suhaimi Ramly[/i]
1. **Determine the upper bound for \( c \):**

   Consider \( n = 2 \). The divisors of \( n \) are \( 1 \) and \( 2 \). We need to find a divisor \( d \) such that \( d \leq \sqrt{2} \) and \( \tau(d) \geq c \sqrt{\tau(2)} \).

   - For \( d = 1 \), \( \tau(1) = 1 \).
   - For \( d = 2 \), \( \tau(2) = 2 \).

   Since \( \sqrt{2} \approx 1.414 \), the only divisor \( d \leq \sqrt{2} \) is \( d = 1 \). Therefore, we need:
   \[
   \tau(1) \geq c \sqrt{\tau(2)} \implies 1 \geq c \sqrt{2} \implies c \leq \frac{1}{\sqrt{2}}.
   \]

2. **Show that \( c = \frac{1}{\sqrt{2}} \) works for squarefree \( n \):**

   Let \( n = p_1 p_2 \cdots p_r \) where \( p_i \) are distinct primes and \( r \geq 1 \).

   - If \( r \) is even, let \( d \) be an element in \( \{ p_1 p_2 \cdots p_{r/2}, p_{r/2+1} p_{r/2+2} \cdots p_r \} \). Both elements multiply to \( n \), so one of them is \( \leq \sqrt{n} \). For such \( d \):
     \[
     \tau(d) \geq 2^{r/2}.
     \]
     Since \( \tau(n) = 2^r \), we have:
     \[
     \tau(d) \geq 2^{r/2} = \sqrt{2^r} = \sqrt{\tau(n)}.
     \]
     Therefore:
     \[
     \tau(d) \geq \frac{1}{\sqrt{2}} \sqrt{\tau(n)}.
     \]

   - If \( r \) is odd, let \( d \) be an element in \( \{ p_1 p_2 \cdots p_{(r-1)/2}, p_{(r+1)/2} p_{(r+3)/2} \cdots p_r \} \). Both elements multiply to \( n \), so one of them is \( \leq \sqrt{n} \). For such \( d \):
     \[
     \tau(d) \geq 2^{(r-1)/2}.
     \]
     Since \( \tau(n) = 2^r \), we have:
     \[
     \tau(d) \geq 2^{(r-1)/2} = \sqrt{\frac{2^r}{2}} = \frac{1}{\sqrt{2}} \sqrt{\tau(n)}.
     \]

3. **General case for \( n \):**

   Let \( n = PQ \), where:
   \[
   P = \prod_{\nu_p(n)=1} p \quad \text{and} \quad Q = \prod_{\nu_p(n) \geq 2} p^{\nu_p(n)}.
   \]

   - Since \( P \) is squarefree, there exists \( P_d \mid P \) such that \( P_d \leq \sqrt{P} \) and \( \tau(P_d) \geq \frac{1}{\sqrt{2}} \sqrt{\tau(P)} \).

   - Let:
     \[
     Q_d = \prod_{\nu_p(n) \geq 2} p^{\lfloor \nu_p(n)/2 \rfloor}.
     \]
     Then \( Q_d \mid Q \), \( Q_d \leq \sqrt{Q} \), and:
     \[
     \tau(Q_d) \geq \sqrt{\tau(Q)}.
     \]

   - Let \( d = P_d Q_d \). Then \( d \mid n \), \( d \leq \sqrt{n} \), and:
     \[
     \tau(d) = \tau(P_d Q_d) = \tau(P_d) \tau(Q_d) \geq \left( \frac{1}{\sqrt{2}} \sqrt{\tau(P)} \right) \left( \sqrt{\tau(Q)} \right) = \frac{1}{\sqrt{2}} \sqrt{\tau(P) \tau(Q)} = \frac{1}{\sqrt{2}} \sqrt{\tau(n)}.
     \]

Thus, \( c = \frac{1}{\sqrt{2}} \) is the maximal constant, as claimed. \(\blacksquare\)

The final answer is \( \boxed{ \frac{1}{\sqrt{2}} } \).