Someone is using a scissors to cut a wire of circular cross section and negligible weight. The wire slides in the direction away from the hinge until the angle between the scissors blades becomes $2 \alpha$. The friction coefficient between the blades and the wire, is :-
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$f \cos \alpha=N \sin \alpha$
$\mu \mathrm{N} \cos \alpha=\mathrm{N} \sin \alpha$
$\tan \alpha=\mu$
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