question_answer

  A horizontal power line carries current in East to West direction. What is the direction of the magnetic field due to the current in the power line at a point above and at a point below the power line?

Answer:

                  According to right-hand thumb rule (i) The direction of magnetic field at a point above the power line is from South to North and (ii) The direction of magnetic field at a point below the power line is from North to South.