When paraffin oil and water are poured into a container they separate and the paraffin oil forms a layer on top
of the water. When water and mercury are mixed the water forms a layer on top of the mercury.
a) What can you conclude from these two observations?
norn nil were mixed together?

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.