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  4. Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2 r. The intensity of the magnetic field midway between them is

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Q. Two long straight wires are set parallel to each other. Each carries a current $i$ in the same direction and the separation between them is $2 r$. The intensity of the magnetic field midway between them isPhysics Question Image

Moving Charges and Magnetism

Solution:

$B=\frac{\mu_0}{2 \pi} \cdot \frac{i}{r}-\frac{\mu_0}{2 \pi} \cdot \frac{i}{r}=0$