A metal bar of length 100 mm is inserted between two rigid

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A metal bar of length 100 mm is inserted between two rigid supports and its temperature is increased by 10°C. If the coefficient of thermal expansion is 12 × 10^–6 per °C and the young’s modulus is 2 × 10⁵ MPa, the stress in the bar is

1. zero
2. 12 MPa
3. 24 MPa
4. 2400 MPa

Correct Option: C

Stress = E × strain

= E ×	δl
	l

= Eαt
=2 × 10⁵ × 12 × 10^-6 × 10 =24 mPa