1. A metal wire is 1 mm diameter and 1 m long. It is stretched by a force of 2 N. Calculate the change in
diameter. E = 90 GPa and n = 0.3 (Answer -8.5 x 10-6 mm).
Explain what happens to the resistance of the wire.
2. Explain the significance of Poisson's ratio to the behaviour of strain gauges.
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