Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
The torque required to produce a unit twist in a rod of length Z and radius r is (1) directly proportional to\[{{r}^{2}}\] (2) directly proportional to\[{{r}^{4}}\] (3) inversely proportional to\[{{r}^{2}}\] (4) inversely proportional to \[l\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
\[\tau =\frac{\pi \eta {{r}^{4}}}{2l},\tau \propto {{r}^{4}}\]and\[\tau \propto (1/l)\] where \[\eta =\]modulus of rigidity \[r=\]radius of rod \[l=\]length of rod Other, central maximum thus shifts vertically downward and so, do the other fringes. Hence, choice is correct.
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