Field Lines
Field lines are imaginary lines used to show the shape, direction, and strength of a magnetic field.
Practice This ConceptMain explanation
Teacher explanation
Field lines help us read a magnetic field visually. They start from the north pole outside a magnet and enter the south pole. Where the lines are closer, the magnetic field is stronger. Where they are farther apart, the field is weaker. In the lab and in diagrams, field lines help students understand how a compass would align in different positions.
Example
Around a bar magnet, the lines curve from the north pole to the south pole and do not intersect each other.
Simple analogy
Closer lines mean stronger field; crossing lines are never allowed.
Common confusion
Students often think field lines are real wires or tracks. They are only a diagrammatic way to show field pattern.
Exam tip
If asked to draw field lines, keep the curves smooth, closed around the magnet, and never let two lines cross.
Answer writing and exam use
1-mark use
Write the exact meaning of field lines in one clean line.
2-mark use
Define field lines and add one example or condition.
3-mark use
Explain field lines, show the method or example, and mention the common mistake.
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