How much physical activity should an adult have each week?
a.
60 minutes per day, 7 days a week
b.
30 minutes per day, 7 days a week
c.
60 minutes per day, 5 days a week
d.
30 minutes per day, 5 days a week

select the best answer from the choices provided.

a
b
c
d

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.