A-LevelPhysicsDeformation of solidsFeb/Mar 2017Paper 4 Q710 Marks
(b) In a strain gauge, the increase in resistance ΔR depends on the increase in length ΔL. The variation of ΔR with ΔL is shown in Fig. 7.1. 8 ΔR/Ω 6+ 4 2- 0 0 2 4 6 8 10 ΔL/10⁻⁵ m Fig. 7.1 The strain gauge is connected into a circuit incorporating an ideal operational amplifier (op-amp), as shown in Fig. 7.2. +6.00 VO strain gauge +5 V +2.00 V OVO 153.0 Ω A + -5 V X Y Fig. 7.2
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