Two planets have the same surface gravity, but planet b has twice the radius of planet a. if planet a has mass m, what is the mass of planet b? a. m/ b. m c. m d.4m e. m/4

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.