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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 a/2 and 2a is
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Mar 20, 2022
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12th Physics
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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 a/2 and 2a is .................
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(a) `1/4` (b) 4 (c) 1 (d) `1/2`
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