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Investigating how the e.m.f. across Opposite Faces of a Piezoelectric Crystal Varies with both Compressive and Tensile Forces
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Investigating how the e.m.f. across Opposite Faces of a Piezoelectric Crystal Varies with both Compressive and Tensile Forces Aim To investigate how the emf across a piezoelectric crystal varies when both compressive and tensile forces are applied to it. Background information A piezoelectric crystal is a type of crystal that, when put under compressive or tensile forces, produces a high voltage at a low current, similar to that of static electricity. This is not enough to light a bulb, but if the crystal is struck with force a current large enough can be produced to flash a small neon lamp, or make a click on an amplifier. Apparatus Superglue 1 x uniform 1m metal rod (like a metal ruler) 1 x pivot 1 x clamp stand 1 x boss 1 x G-clamp 1 x metal block 1 x quartz crystal (piezoelectric crystal) 1 x set of masses 2 x wires 2 x crocodile clips 2 x pieces of foil 1 x digital voltmeter (reading to 2 d.p.) Diagram Essentially,...
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