A horizontal overhead power line carries a current of $90A$ in east to west direction . What is the magnitude of the magnetic field due to the current $1.5 m$ below the line .

Question

$\begin{array}{1 1} 1.2 \times 10^{-4}\;T \\ 1.2 \times 10^{-5}\;T \\ 3.5 \times 10^{5}\;T \\ 3.5 \times 10^{4}\;T\end{array} $