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Consider a long straight wire of a circular cross-section (radius a) carrying a steady current I. The current is uniformly distributed across this cross-section. The distances from the centre of the wire’s cross-section at which the magnetic field [inside the wire, outside the wire] is half of the maximum possible magnetic field, any where due to the wire,will be
(1) [a /4, 3a /2] 2) [a /2,2a] 3)[a/2,3a]. 4) [a /4,2a]
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