How many time constants will elapse before the current in a charging `R-C` circuit drops to half of its initial value?

Explanation

To solve the problem of how many time constants will elapse before the current in a charging R-C circuit drops to half of its initial value, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formula for Current in an R-C Circuit**:
The current \( I \) in a charging R-C circuit is given by the equation:
\[
I = I_0 e^{-\frac{t}{RC}}
...