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The Biot-Savart field direction is perpendicular to the plane containing dl and:
Ar
BB
Cq
Dv
Answer & Solution
Correct answer: A. r
1. The element dl and the displacement to the point define a plane.
2. The field points straight out of that plane.
3. So it is perpendicular to the plane containing dl and r.
_Source: NCERT Class 12 Physics Part I, Chapter 4, Moving Charges and Magnetism._
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