Physics, asked by mannat06, 10 months ago

pls tell.............​

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Answered by diksha254134
0

Answer:

We will assume the vertical displacement x to be very small compared to L . Change in the length will be calculated by difference of final total length and initial length 2L . according to diagram...

hence change in lenght

triangle L=(PR+RQ)-PQ

=2PR-PQ

=2(L²+X²)½-2L=2L (1+x²/L²)½-2L

STRAIN=TRIANGLEL/2L=x²/2L²

HENCE option a is correct

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