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Which of the following statements is incorrect regarding magnetic field lines?

easy MCQ 1 mark Class 10 · Science · Magnetic Effects of Electric Current
  1. Magnetic field lines form continuous closed loops.
  2. The relative strength of the magnetic field is shown by the degree of closeness of the field lines.
  3. Two magnetic field lines intersect each other at a point where the magnetic field is very strong.
  4. Outside a bar magnet, the direction of magnetic field lines is from North pole to South pole.
Answer
Two magnetic field lines intersect each other at a point where the magnetic field is very strong.

The correct answer is Two magnetic field lines intersect each other at a point where the magnetic field is very strong. — Therefore, the statement claiming that field lines intersect at points of strong field is incorrect.

Step-by-step solution

  1. Recall the property of magnetic field lines regarding intersection: If two field lines were to intersect, it would mean that at the point of intersection, a magnetic compass needle would point in two different directions at the same time.
  2. Since a compass needle can only point in one unique direction at any single point in space, magnetic field lines can never intersect each other.
  3. Evaluate the options: Forming closed loops, closeness showing field strength, and direction from North to South outside a bar magnet are all correct statements.
  4. Therefore, the statement claiming that field lines intersect at points of strong field is incorrect.
Common mistake: Thinking field lines can cross each other where the magnetic field is extremely strong.

Concept tested: Properties of magnetic field lines

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