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two rods of length l2 each coefficient of linear expantion A2 are connected freely to a third rod of length l1 of coefficient opf linear expantion A1 to form an isoceles triangle ,if the arrangement is supported by a knife edge at ''D'' such that BD=DC THEN ON uniform heating which of relations are not possible?
A}AB=AC always
B}BD=DC always
C}AD is constant if A1l12 =4l22A2
N ALSO EXPLAIN ME WHT IS MEANT BY KNIFE EDGE
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