Physics Elasticity Question 91
Question: A and B are two wires. The radius of A is twice that of B. They are stretched by the some load. Then the stress on B is
[MP PMT 1993]
Options:
A) Equal to that on A
B) Four times that on A
C) Two times that on A
D) Half that on A
Show Answer
Answer:
Correct Answer: B
Solution:
$ r=\frac{r}{r} $ \ $ r\propto \frac{r}{\pi {{r}^{r}}} $
$ \frac{S _{B}}{S _{A}}={{\left( \frac{r _{A}}{r _{B}} \right)}^{2}}={{(2)}^{2}}\Rightarrow S _{B}=4S _{A} $
BETA
