A metal rod is shaped into a ring with a small gap. If this is heated, then (A) the length of th...

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A metal rod is shaped into a ring with a small gap. If this is heated, then
(A) the length of the rod will increase.
(B) the gap will decrease.
(C) the gap will increase
(D) the diameter of the ring will increase in the same ratio as the length of the rod.
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