A) \[u={{u}_{\max }}\,[1-{{(r/R)}^{2}}]\]
B) \[u={{u}_{\max }}\,[{{R}^{2}}-{{r}^{2}}]\]
C) \[u={{u}_{\max }}\,{{[1-(r/R)]}^{2}}\]
D) \[u={{u}_{\max }}\,{{[1+(r/R)]}^{2}}\]
Correct Answer: A
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