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

  1. Class 10
  2. Chapter 13 Class 10 - Magnetic Effects of Electric Current

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.