Assertion (A) : The stretching of a coil is determined by its shear modulus.
Reason (R) : Shear modulus change only shape of a body keeping its dimensions unchanged.

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A is incorrect, but R is correct

Both A and R are true but R is not the correct explanation of the A.

A is correct, but R is incorrect

Both A and R are true and R is the correct explanation of the A

answer is A.

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Detailed Solution

$s h e a r m o d u l u s = \frac{s h e a r i n g s t r e s s}{s h e a r i n g s t r a i n}$ So, shape of a body changes but its dimensions or volume doesn’t change so, we are using shear modulus for stretching of coil

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