A direct current `I=10A` flows in a long straight round conductor. Find the magnetic flux through a half of the wire's cross-section per one meter of its length.

Explanation

To solve the problem of finding the magnetic flux through half of the wire's cross-section per one meter of its length when a direct current of \( I = 10 \, \text{A} \) flows in a long straight round conductor, we can follow these steps:

### Step 1: Understand the Setup
We have a long straight round conductor with a radius \( r \) and a current \( I = 10 \, \text{A} \) flowing through it. We need to find the magnetic flux through half of the cross-section of the wire per one meter of its length.

### Step 2: Use Ampere's Circuital Law
According to Ampere's Circuital Law, the magnetic field \( B \) around a long straight conductor can be calculated using the formula:
\[
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