First slide

Stress and strain

Question

The maximum load, a wire can withstand without breaking, when its length is reduced to half of its original length, will [NCERT Exemplar]

Moderate

A

be double
B

be half
C

be four times
D

remain same

Solution

We know that,
Breaking force = $\frac{Breaking force}{Area of cross - section}$ …(i)
When length of the wire changes, area of cross-section remains same.
Hence, breaking force will be same when length changes.

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