A metal strain gauge factor of two. Its nominal resistance

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A metal strain gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10^–5, the value of change of resistance in response to the strain is

1. 240 ohms
2. 2 × 10⁵ohm
3. 2.4 × 10^–3 ohm
4. 1.2 × 10^–3 ohm

Correct Option: C

Gauge factor =	dR/R
	ξ_a

∴	dR	= 2 × 10^-5
	R

or dR = 2 × 120 × 10^–5 = 2.4 × 10^–3