Given a 250Ω strain gage with a gage factor of 1 which is mounted to a metal bar 0.6m long. The bar is stretched under a tension force and the resistance changes to 251.4 Ω. How much was the bar stretched? _ _mm (Answer in mm to 2 decimal places) What is the length of the bar after it is stretched?

the bar was stretched by

the length of the after it was stretched is

Explanation:

From the information given:

The strain gauge resistance R = 250 Ω

The gauge factor = 1

The original length L = 0.6 m = 600 mm

After the bar is being stretched under tension force;

the new resistance

The gauge factor

where;

  and

ΔR = 251.4 - 250

ΔR = 1.4 Ω

Thus, the length of the after it was stretched is

Thus, the bar was stretched by

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1

explanation: