In a slide-wire (metre) bridge a known 2 Ω resistor sits in the left gap and an unknown resistor Rₓ in the right gap. The galvanometer reads zero when the jockey is 25 cm from the left end A of the 100 cm wire. Find Rx.
The Wheatstone bridge in the diagram is balanced: the galvanometer reads zero. R₁ = 80 Ω, R₂ = 1000 Ω and R₃ = 60 Ω. Find the unknown resistor R4.
A bridge with four 150 Ω arms is supplied with 9 V. When the sensor R₂ changes, the output reads Vab = 214.3 mV. Find the exact change ΔR of R₂.
A bridge with four 470 Ω arms is supplied with 15 V. When the sensor R₂ changes, the output reads Vab = 37.31 mV. Find the exact change ΔR of R₂.
A 120 Ω strain gauge with gauge factor 2 is bonded to a steel bar. Under load its resistance rises by 0.096 Ω. Find the strain ε in microstrain (µε).
A bridge with 350 Ω arms is excited with 10 V and has one active gauge (quarter bridge). The gauge factor is 2 and the strain is 1500 µε. Find the bridge output Vo in mV.
Full step-by-step solutions: practise this topic on examproblems.com.