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Moving Charges and Magnetism — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
Question
Same current is flowing through two parallel conducting wires at a distance $d$ in opposite directions. The intensity of magnetic field at the midpoint between the wires is :
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Answer

(b)$\frac{2 \mu_0 i}{\pi d}$

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