Where does this energy come from? From elastic potential energy stored in jumper's tensed muscles. From kinetic energy stored in the ground below jumper. From elastic potential energy stored in the ground below jumper. From kinetic energy stored in jumper's tensed muscles.

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?