A slightly conical wire of length L and end radii r1 and r2 is stretched by two forces F and F applied parallel to the length in opposite directions and normal to the end faces. If Y denotes Young's modulus, then the extension produced is: a.FL/pir1 r2Y b.FLY/pir1 r2 c.FL/pir1 Y d.FL/pir1^2Y

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