Which of the following describes resistance?

question 16 options:

a. completely stops electron flow
b. impedes the flow of electrons
c. is an insulator
d. has to do with the voltage in the circuit

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?