Which rod shape yields more spiral pattern toward the ends?

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Multiple Choice

Which rod shape yields more spiral pattern toward the ends?

Explanation:
The way the rod tapers along its length changes how a strand of hair twists as it wraps. A concave rod narrows toward the middle and widens toward the ends, so when you wind hair on it, the central portion sits on a smaller circumference while the ends sit on a larger one. As the strand follows this changing shape, the wrap tends to take on a longer, more winding path toward the ends, producing a more pronounced spiral pattern there. In contrast, a straight rod gives a uniform curl along the entire length, and a convex rod, which narrows toward the ends, tends to distribute the curl differently, with less emphasis on a spiral pattern toward the ends.

The way the rod tapers along its length changes how a strand of hair twists as it wraps. A concave rod narrows toward the middle and widens toward the ends, so when you wind hair on it, the central portion sits on a smaller circumference while the ends sit on a larger one. As the strand follows this changing shape, the wrap tends to take on a longer, more winding path toward the ends, producing a more pronounced spiral pattern there. In contrast, a straight rod gives a uniform curl along the entire length, and a convex rod, which narrows toward the ends, tends to distribute the curl differently, with less emphasis on a spiral pattern toward the ends.

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