# A telephone cable at a place has four long straight horizontal wires carrying a current of $1.0 \;A$ in the same direction east to west. The earth magnetic field at the place is $0.39 \;G$ and the angle of dip is $35^{\circ}$. The magnetic declination is nearly zero. what are the resultant magnetic fields at points $4.0 \;cm$ below the cable ?
$\begin{array}{1 1} 2.5 \times 10^{-5}\;T \\ 2.5 \times 10^{-4}\;T \\ 2.5 \times 10^5 \;T \\ 2.5 \times 10^4 \;T \end{array}$