STANDARD Physics Magnetic Field due to Moving Charges MCQ Question
If an electron is moving with velocity v produces a magnetic field B, then
the direction of field B will be same as the direction of velocity v.
the direction of field B will be opposite to the direction of velocity v.
the direction of field B will be perpendicular to the direction of velocity v.
the direction of field B does not depend upon the direction of velocity v.
Correct Answer
Detailed Explanation
According to Biot-Savart law, the magnetic field B = (μ₀/4π) * (q(v × r) / r²). The direction of B will be along v × r, i.e., perpendicular to the plane containing v and r.
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