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  4. A straight section PQ of a circuit lies along the X axis from X = -a/ 2 to x= a/2 and carries a steady current I . Then the magnetic field due to the PQ section at a distance x= +a will be

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Q. A straight section PQ of a circuit lies along the X axis from X = -a/ 2 to x= a/2 and carries a steady current I . Then the magnetic field due to the PQ section at a distance x= +a will be

Moving Charges and Magnetism

Solution:

$\bar{dl}\times \bar{r}=0$