AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
At the point of intersection, the compass needle would have to point in two different directions simultaneously, which is physically impossible. Since a magnetic field has a unique direction at every point, two field lines cannot cross — there can be only one direction of the field at any given point.
Source: Chapter 12, Section 12.1 – Magnetic Field and Field Lines
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The textbook directly states: "If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible." Examiners expect you to clearly state (1) what impossible situation arises — two directions at one point — and (2) why that violates the nature of a magnetic field (unique direction at every point). Both points are needed for full 2 marks.