What voltage is required to sustain a current of 0.85 A through a lightbulb
with a resistance of 140 s2?
ОА. 160 у
ОВ. 100 у
Ос. 120 V
OD. 140 у

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.