A long straight wire carries a current of `35A`. What is the magnitude of the field `vecB` at a point `20cm` from the wire?

Explanation

To find the magnitude of the magnetic field \( \vec{B} \) at a point \( 20 \, \text{cm} \) from a long straight wire carrying a current of \( 35 \, \text{A} \), we can use Ampère's circuital law. The formula for the magnetic field around a long straight conductor is given by:

\[ B = \frac{\mu_0 I}{2 \pi r} \]

where:
- \( B \) is the magnetic field,
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