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An infinitely long wire carrying current...

An infinitely long wire carrying current I is along Y-axis such taht its one end is at point A(0,b) while the wire extends upto `+oo`. The magnitude of magnetic field strength at point (a,0) is

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The correct Answer is:
`(mu_(0)I)/(4pia)(1-(b)/(sqrt(a^(2)+b^(2))))`
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