(i) Two magnetic field lines do not intersect each other. Why ? (ii) How is a uniform magnetic field in a given region represented ? Draw a diagram in support of your answer.
(i) Two magnetic field lines do not intersect each other. Why ? (ii) How is a uniform magnetic field in a given region represented ? Draw a diagram in support of your answer.
(i) Two magnetic field lines do not intersect because if they did, it would mean that at the point of intersection, the magnetic field has two different directions. This is impossible as a compass needle can only point in one direction at a single point.
(ii) A uniform magnetic field is represented by parallel, equidistant straight lines pointing in the same direction.
Marking Scheme
- 11 mark for explaining why lines don't intersect (unique direction).
- 20.5 mark for mentioning parallel equidistant lines.
- 30.5 mark for the diagram.
Hint
Think about what a compass would do if it were placed at an intersection point.
Quick Oral Answer
Magnetic field lines never intersect because the field direction at any point must be unique. A uniform field is shown by parallel, equally spaced lines.
Analysis & Explanation
Magnetic field lines are a visual tool to represent the direction and strength of a magnetic field. The direction is defined by the north pole of a compass. Since the field at any point is unique, lines cannot cross. Uniformity implies that the strength and direction are the same everywhere, which is geometrically shown by parallel lines with equal spacing.
Common Mistakes
- 1Drawing lines that are parallel but not equidistant for a uniform field.
- 2Failing to mention the compass needle logic for the intersection part.
Interesting Facts
The magnetic field inside a long current-carrying solenoid is nearly uniform.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2024?
This question carries 2 marks in the CBSE Class 10 Science 2024 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Magnetic Effects of Electric Current" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Magnetic Field Lines" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2024 paper?
This is a Very Short Answer question from Section B in the CBSE Class 10 Science 2024 paper.