Explain the precautions taken in determinations of Young’s modulus of a wire. 

• After each reading, the load is removed to check that the wire returns to its original length, to ensure that elastic limit is not exceeded.
• Long wires are used to achieve measurable expansion
• Thin wires are used to produce high tensile stress
• Identical wires are used to eliminate error of expansion or contraction due to changes in temperature.

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