One astronomer has observed an apparent lengthening of the electromagnetic waves given off by a star. which of these conclusions is correct about the star? its parallax is increasing. it is moving towards earth. its wavelength is decreasing. it is moving away from earth.

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.