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A long insulated copper wire is closely ...

A long insulated copper wire is closely wouind as a spiral of 'N' turns . Thw spiral has inner radius 'a' and outer radius 'b' . The spiral lies in the ` XY `plane and a steady current ' I' flows through the wire . The Z - component of the magnetic field at the centre of the spiral is

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The correct Answer is:
`[(mu_(0)IN)/(2 (b - a)) 1n ((b)/(a))]`
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PHYSICS GALAXY - ASHISH ARORA-MAGNETIC EFFECTS OF CURRENT AND MAGNETISM-Practice Exercise
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