It is observed to be at a distance of 50 kiloparsecs and moving at a speed of 150 kilometers/second. What is the mass contained within the radius of the orbit of the Large Magellanic Cloud and, therefore, a lower limit to the mass of our Galaxy?

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.