Which of the following is wrong regarding Searle's apparatus method in finding Young's modulus of a given wire? (a) Average elongation of wire will be determined with a particular load while increasing the load and decreasing the load. (b) Reference wire will be just taut and experimental wire will undergo foe elongation. ( c) Air bubble in the spirit level will be disturbed from the central position due to relative displacement between the wires due to elongation. (d) Average elongation of the wires is to be determined by increasing the load attached to both the wires.
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The wrong statement regarding Searle's apparatus method in finding Young's modulus of a given wire is:
- Searle's apparatus is the apparatus in which two wires are present: reference wire and experimental wire. Both are connected by a plate and a spirit level is kept on it. Spirit level is used to check whether the connecting plate is horizontal or not. Reference weight is hung through both wires. The reference wire is not disturbed. Known weights are added to experimental wire such that it pulls below. Expansion is observed in the experimental wire. Change in the length is used to calculate Young's modulus.
- Option (a) is correct as we experiment both increasing and decreasing load.
- Option (b) is correct as we add weight only to the experimental wire.
- Option (c) is also correct as one wire elongates and the other remains the same.
- Option (d) is wrong as reference wire remains as it is. The only experimental wire is loaded and hence it elongates.
- Therefore, the answer is Option (d).
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