A long straight wire carries a current of $35\;A$ what is the magnitude of the field B at a point $20\;cm$ away from the wire ?

Question

$\begin{array}{1 1} 3.5 \times 10^{-5}\;T \\ 3.5 \times 10^{-4}\;T \\ 3.5 \times 10^{5}\;T \\ 3.5 \times 10^{4}\;T\end{array} $