Which of the following is the correct definition for Gauge factor?(a) (incremental change in resistance due to strain/resistance of an unstretched wire)*(unstretched length of wire/incremental change in length)(b) (resistance of an unstretched wire/incremental change in resistance due to stress)*(unstretched length of wire/incremental change in length)(c) (incremental change in resistance due to stress/resistance of an unstretched wire)*(incremental change in length/unstretched length of wire)(d) (incremental change in resistance due to stress/resistance of an unstretched wire)*(unstretched length of wire/incremental change in length)The question was asked in exam.The above asked question is from Implantable Telemetry Systems in portion Biomedical Telemetry of Biomedical Instrumentation

Which of the following is the correct definition for Gauge factor?(a)

1.	Which of the following is the correct definition for Gauge factor?(a) (incremental change in resistance due to strain/resistance of an unstretched wire)(unstretched length of wire/incremental change in length)(b) (resistance of an unstretched wire/incremental change in resistance due to stress)(unstretched length of wire/incremental change in length)(c) (incremental change in resistance due to stress/resistance of an unstretched wire)(incremental change in length/unstretched length of wire)(d) (incremental change in resistance due to stress/resistance of an unstretched wire)(unstretched length of wire/incremental change in length)The question was asked in exam.The above asked question is from Implantable Telemetry Systems in portion Biomedical Telemetry of Biomedical Instrumentation
Answer» RIGHT option is (d) (incremental change in resistance due to stress/resistance of an unstretched wire)(unstretched LENGTH of wire/incremental change in length) Easiest explanation: Gauge factor is defined as (incremental change in resistance due to stress/resistance of an unstretched wire)(unstretched length of wire/incremental change in length). Gauge factor GIVES information on the expected resistance change or output signal at maximum permissible elongation. The gauge factor determines to a large EXTENT the SENSITIVITY of the wire when it is made into a practical strain gauge.

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