Q-4:- A long straight wire of radius " a " carries a steady current I. The current is uniformly, distributed across its cross-section. The ratio of magnetic field (vec(B)) at (a)/(2) and 2a will be: [A]4 [B]1 [] (1)/(4)

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Q-4:- A long straight wire of radius &#34; a &#34; carries a steady current I. The current is uniformly, distributed across its cross-section. The ratio of magnetic field (vec(B)) at (a)/(2) and 2a will be: [A]4 [B]1  [] (1)/(4)

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