Describe an experiment to determine Young’s Modulus of a steel wire.

Experiment to determine Young’s Modulus for a metal wire

• Two thin, long wires of the same material and length P and Q are suspended from a rigid support.
• P carries a scale M in mm and it’s straightened by attaching a weight at its end.
• Q  carries a Vernier scale which is alongside scale M
• Various loads are added to the test wire and corresponding extensions caused are read off from a Vernier scale.
• The diameter (2r) of the wire is obtained by a micrometre screw gauge, and the cross section  area of the wire A =  4πr²
• A graph of mass (m) of the load against extension e is plotted

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