TS EAMCET · Physics · Mechanical Properties of Solids

A metal rod of area of cross-section \(3 \mathrm{~cm}^2\) is stretched along its length by applying a force of \(9 \times 10^4 \mathrm{~N}\). If the Young's modulus of the material of the rod is \(2 \times 10^{11} \mathrm{Nm}^{-2}\), the energy stored per unit volume in the stretched rod is

A \(13.5 \times 10^5 \mathrm{Jm}^{-3}\)
B \(9 \times 10^5 \mathrm{Jm}^{-3}\)
C \(2.25 \times 10^5 \mathrm{Jm}^{-3}\)
D \(4.5 \times 10^5 \mathrm{Jm}^{-3}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(2.25 \times 10^5 \mathrm{Jm}^{-3}\)

Step-by-step Solution

Detailed explanation

\( \sigma = \frac{F}{A} = \frac{9 \times 10^4 \mathrm{~N}}{3 \times 10^{-4} \mathrm{~m}^2} = 3 \times 10^8 \mathrm{~Pa} \)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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From TS EAMCET

Match the following.
(Take the relative strength of the strongest fundamental forces in nature as one)

I (Fundamental Forces in nature)	II ( Relative Strength)
(A) Strong nuclear force	(e) \(10^{-2}\)
(B) Weak nuclear force	(f) \(1\)
(C) Electromagnetic force	(g) \(10^{10}\)
(D) Gravitational force	(h) \(10^{13}\)
	(I) \(10^{-39}\)

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