A high-voltage copper transmission line with a diameter of 2.40 cm and a length of 250 km carries a steady current of 1.25 103 A. If copper has a free charge density of 8.46 1028 electrons/m3, over what time interval does one electron travel the full length of the line

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Energy flows from the producer level to the level. is called

The ph is the a.independent variable b.the dependent variable c.control group