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Local attraction on a compass due to


1. Metallic object
2. Gravity
3. Current
4. None of the above

1 Answer

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Best answer
Correct Answer - Option 1 : Metallic object

Explanation:

Local attraction: 

  • Local attraction is the phenomenon by which the magnetic needle is constantly prevented to point towards the magnetic north at a place.
  • It is the attraction of the magnetic needle to a local magnetic field other than the earth's magnetic field.
  • It can be caused by iron pipes, steel pipes, vehicles, etc.
  • If the difference between fore bearing and back bearing is 1800 then both the end stations are considered to be free from local attraction

Important points about Local attraction:

1. If difference between fore bearing (FB) and Back bearing (BB) of a line is not equal to 1800 then either of station or both stations are affected by local attraction.

2. If difference between fore bearing (FB) and Back bearing (BB) of a line is equal to 1800 then there are two possibilities:

a) Both stations are free from local attraction.

b) Both stations are affected by same value of local attraction.

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