Which one of the following statements about magnetic field line is NOT correct?

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NDA (Held On: 22 April 2018) General Ability Test Previous Year paper
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  1. They can emanate from a point
  2. They do not cross each other
  3. Field lines between two poles cannot be precisely straight lines at the ends.
  4. There are continuous field lines within a bar magnet

Answer (Detailed Solution Below)

Option 1 : They can emanate from a point
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NDA 01/2025: English Subject Test
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Detailed Solution

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CONCEPT:

Magnetic field lines: The imaginary lines which represent the direction of the magnetic field are called as magnetic field lines.

F2 J.K Madhu 03.04.20 D2

 

  • The tangent at any point on the field lines gives the direction of the magnetic field vector at that point.
  • Magnetic lines of force always emerge or start from the North Pole and terminate on the South Pole.

EXPLANATION:

  • A magnetic monopoles (either North Pole or South Pole) never exists alone due to which the magnetic field lines cannot emanate from a point or terminate at a point.
  • The two magnetic field lines do not intersect each other because if they do it means at the point of intersect the compass needle is showing two different directions which is not possible.
  • There can't be such straight field lines between magnetic poles as the magnetic field always form closed loops
  • There are continuous field lines exists inside the bar magnet. 
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