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Which type of elasticity is involved in tangential push on the upper face of a block?

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Which type of elasticity is involved in tangential push on the upper face of a block?

(a) Bulk modulus

(b) Young’s modulus

(c) Rigidity modulus

(d) Elastic limit

The question was asked during a job interview.

My query is from Elasticity topic in section Thermal Properties of Matter of Engineering Physics I

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Right option is (c) Rigidity modulus

For explanation: Rigidity modulus is defined as the ratio between tangential stress and shearing strain. When a tangential stress is applied to the upper face of a block, the cube gets deformed and there is relative displacement.

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