An object moving in a circle at a constant speed is accelerating. why?
a. because it is going faster
b. because it has constant velocity
c. because its direction is changing
d. because the distance it is traveling is changing

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?