What Is the Difference Between Semi-Infinite and Infinite Wires?

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izzmach
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I am studying magnetic field and I could not distinguish the difference of semi-infinite and infinite wire. Can someone please explain briefly the difference of these two? Thank you.
 
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I would imagine an infinite wire would run from -infinity to +infinity.
A semi infinite wire would be from some value to +/- infinity.
 
infinite means no end on both sides semi infinite means which is fixed at one point and other point is not fixed eg line infinite and ray semi infinite