# Civil Engineering - Strength of Materials - Discussion

Discussion Forum : Strength of Materials - Section 4 (Q.No. 40)
40.
If the stress produced by a prismatic bar is equal to the working stress, the area of the cross-section of the prismatic bar, becomes
zero
infinite
maximum
minimum.
Explanation:
No answer description is available. Let's discuss.
Discussion:
15 comments Page 1 of 2.

M. Waseem said:   2 years ago
Explanation:
as we know that stress= Îµ*E
or P/A = Îµ* E
or A = P/Îµ*E.

Now if working stress equals the stress in the bar then the strain (Îµ) will be zero, and according to the above equation when strain is zero then Area becomes Infinite.
A = P/0*E
A = Infinite.
(3)

Aashish Tiwari said:   11 months ago
Here working stress applied is equal to stress produced in the prismatic bar.
So, the resultant stress becomes zero and we have
Stress =force/area.
Area = force/stress = force/0 = infinite.
(2)

Jay brahmabhatt said:   8 years ago
Stress = force/area.

According to this, if we increase the stress so the area of section is decreased. So when stress is equal to working stress so the area becomes infinite.

Hemraj Basnet said:   5 years ago
Consider S = stress.

Then partial derivative of stress with respect area.
dS/dA=pd(A power minus 1)/dA,
solve it,
A=p/0,
A= infinite.

Khurshid said:   5 years ago
I think area has to e infinite when stress is maximum in order to avoid unwanted situation.
(1)

Neel said:   6 years ago
Freely prismatic bar stress is equal zero. So area is infinite.

Deepak kumar said:   6 years ago
Working stress means maximum so the area will be minimum.

B.Nehru said:   4 years ago
Yes, you are right, Thanks @Jay Brahmabhatt.

VIP said:   7 years ago
D should be the correct answer.

Satya said:   6 years ago
Option D is correct I think.