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[" (When "r>a)],[" Example "Q" is A stra...

[" (When "r>a)],[" Example "Q" is A straight thick long wire of "],[" uniform cross-section of radius "a" is carrying a "],[" steady current "I" .Calculate the ratio of magnetic "],[" field at a point "a/2" above the surface of the wire "],[" to that at a point "a/2" below its surface.What is "],[" the maximum value of the field of this wire? "]

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