Using Ampere's circuital law, obtain an expression for the magnetic induction at a point near an infinitely long straight conductor carrying an electric current.

Explanation

To derive the expression for the magnetic induction (magnetic field) at a point near an infinitely long straight conductor carrying an electric current using Ampere's circuital law, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Setup**:
- Consider an infinitely long straight conductor carrying a current \( I \).
- We want to find the magnetic field at a distance \( r \) from the wire.

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