A conductor of resistance `25 Omega` of diameter 0.2 mm is connected to a battery of 200 V . Calculate the current density for the conductor.

Explanation

To solve the problem of calculating the current density in a conductor with a given resistance and diameter, we can follow these steps:

### Step 1: Calculate the Current (I)
We know the relationship between voltage (V), current (I), and resistance (R) is given by Ohm's Law:
\[ I = \frac{V}{R} \]
Given:
...