A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

 

Answer

To find Magnetic Field, we will use the Right Hand Thumb Rule.

 

Now,

  • Since current flows from East to West, pointing out thumb towards West
  • If we curl our fingers, that will show direction of magnetic field

example-13.1---magnetic-effects-class-10---answer-by-teachoo.png

So, for a point directly above wire, magnetic field is into the paper

and for a point directly below wire, magnetic field is out of the paper

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo