Which of the following would produce the most power? a
A mass of 10 kilograms lifted 10 meters in 10 seconds
b
A mass of 5 kilograms lifted 10 meters in 5 seconds
c
A mass of 10 kilograms lifted 10 meters in 5 seconds
d
A mass of 5 kilograms lifted 5 meters in 10 seconds

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.