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Q)

A long straight wire of radius $a$ carries a steady current $i$. The current is uniformly distributed across its cross-section. The ratio of the magnetic field at $\frac{a}{2}$ and $2a$ is :


( A ) $\frac{1}{4}$
( B ) 4
( C ) 1
( D ) $\frac{1}{2}$

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