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11.The longitudinal extension of an elastic material is verysmall. In order to have an appreciable change, thematerial must be in the form of:(a) a long thin wire(b) thick block of any cross-section(c) thin block of rectangular cross-section(d) short thin wire. |
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Answer» Thin wires can't resist the stress needed to stretch the wire and may break, so In order to see appreciable change , Thick wire is need. option b |
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