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Moving Charges and Magnetism — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
Question
According to Ampere's circuital law \[ \oint \overrightarrow{B} \cdot \overrightarrow{d l}= \] __________.
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Answer

$\mu_0 i$

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