NUST NET Physics · Physics · Solids and electronics. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.
When a force stretches a solid, stress is the force on each square metre of cross-section and strain is the fractional change in length. Up to the proportional limit stress is proportional to strain. Their ratio is Young's modulus, a property of the material and not of the size or shape of the sample.
Solids are classed by how their atoms are arranged. Crystalline solids have a regular repeating pattern and a sharp melting point, amorphous solids such as glass have no long-range order, and polymeric solids are made of long chain molecules.
Magnetic materials are diamagnetic, paramagnetic or ferromagnetic. Ferromagnets contain domains that line up in a field; this is lost above the Curie temperature.
Treating area as proportional to diameter. Area depends on diameter squared, so a wire of twice the diameter has four times the area and a quarter of the extension for the same force and length.
Answer: 1.0 × 10−3 m (1.0 mm)
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