A wire is suspended from the ceiling and stretched under the action of a weight $$F$$ suspended from its other end. The force exerted by the ceiling on it is equal and opposite to the weight.

 a. Tensile stress at any cross-section $$A$$ of the wire is $$F/A.$$ b. Tensile stress at any cross-section is zero. c. Tensile stress at any cross-section $$A$$ of the wire is $$2F/A.$$ d. Tension at any cross-section $$A$$ of the wire is $$F.$$

The correct statements are:
1. (a), (b)
2. (a), (d)
3. (b), (c)
4. (a), (c)

Subtopic:  Stress - Strain |
80%
From NCERT
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A copper and a steel wire of the same diameter are connected end to end. A deforming force $$F$$ is applied to this composite wire which causes a total elongation of $$1$$ cm. The two wires will have:

 a. the same stress b. different stress c. the same strain d. different strain

Choose the correct option:

 1 (a, b) 2 (a, d) 3 (b, c) 4 (c, d)

Subtopic:  Elasticity | Stress - Strain |
78%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A rod of length l and negligible mass is suspended at its two ends by two wires of steel (wire A) and aluminium (wire B) of equal lengths (figure). The cross-sectional areas of wires A and B are  respectively. ()

 a. Mass m should be suspended close to wire A to have equal stresses in both wires. b. Mass m should be suspended close to B to have equal stresses in both wires. c. Mass m should be suspended in the middle of the wires to have equal stresses in both wires. d. Mass m should be suspended close to wire A to have equal strain in both wires.

The correct statements are:

1. (b, c)

2. (a, d)

3. (b, d)

4. (c, d)

Subtopic:  Elasticity | Stress - Strain |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh