The tangent to a field line at a point gives the field's:
AWavelength
BDirection
CMagnitude
DFrequency
Answer & Solution
Correct answer: B. Direction
1. A field line is a curve drawn through the field.
2. At each point it runs along the field itself.
3. So its tangent gives the direction of the field there.
_Source: NCERT Class 12 Physics Part I, Chapter 5, Magnetism and Matter._
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