Two main sequence stars appear equally bright in the night sky. Star P has a spectral class of M2 and Star Q has a spectral class of B8. Explain your answers. Which is cooler? Which has a greater absolute magnitude? Which emits more energy per unit surface area? Which is closer to the observer?

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.