Question

A strain gauge has a gauge factor of 4. it is attached to a metal bar that stretches from 0.25m to 0.255m when strained. what is percentage change in resistance

Answer 1

Answer:

8%

Explanation:

given

gauge factor = 4

L1 = 0.25m

L2 = 0.255m

Therefore , ∆L = L2 - L1 = 0.005m

and L= L1 = 0.25 m

Now , ∆R/R = Gf × ∆L/L = 0.08

Hence , % change in resistance = ∆R/R × 100

= 8%