A long wire carrying a $4\mathrm{.}2$ AA current perpendicular to the xyxy$-$plane intersects the xx$-$axis at x$=1\mathrm{.}7$cmx$=1\mathrm{.}7$cm$.$ A second, parallel wire carrying a $2\mathrm{.}8$ AA current intersects the xx$-$axis at x$=+1\mathrm{.}7$cmx$=+1\mathrm{.}7$cm$.$

Part A

At what point on the xx$-$axis is the magnetic field zero if the two currents are in the same direction?

Express your answer with the appropriate units.

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xx $=$

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Part B

At what point on the xx$-$axis is the magnetic field zero if the two currents are in opposite directions?

Express your answer with the appropriate units.

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x