Magnetic Force on a Wire Carrying a Current

A conducting thick copper rod of length $1 \mathrm{m}$ carries a current of $15 \mathrm{A}$and is located on the Earth's equator. There the magnetic flux lines of the Earth's magnetic field are horizontal, with the field of $1.3\times {10}^{-4}\mathrm{T}$, south to north. The magnitude and direction of the force on the rod, when it is oriented so that current flows from west to east, are 

Can you suggest an experiment to draw magnetic field lines of the magnetic field around the current carrying wire?