A thread is wound around a cylindrical bottle. What would be the locus of a point on the thread, when it is unwound?
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Missing Options in the Question >
[A] . A straight line [B] . A circle
[C] . An involute [D] . A spiral
[E] . A cycloid
Answer > [C] . An involute
When the string is unwound, from the given curve position locus of it will be in the plane of the curve. So the locus of the points will be in Involute.
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