Which one of the following statements about magnetic field lines is NO

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

[amp_mcq option1=”They can emanate from a point” option2=”They do not cross each other” option3=”Field lines between two poles cannot be precisely straight lines at the ends” option4=”There are no field lines within a bar magnet” correct=”option4″]

This question was previously asked in

UPSC NDA-1 – 2018

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Magnetic field lines form continuous closed loops. Outside a magnet, they are depicted as originating from the North pole and terminating at the South pole. Inside the magnet, the field lines continue from the South pole to the North pole, completing the loop. Therefore, there *are* magnetic field lines within a bar magnet.

Magnetic field lines are continuous and form closed loops, unlike electric field lines which start on positive charges and end on negative charges. This reflects the absence of magnetic monopoles.

Statement A is broadly correct in that lines emanate from the pole regions (which are not mathematical points but areas) of a magnet. Statement B is a fundamental property: field lines never cross each other, as this would imply two different directions for the magnetic field at a single point, which is impossible. Statement C is correct: field lines are generally curved, especially near the poles and in the region between them, only becoming approximately straight far from the magnet or in very specific configurations.

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