A free bar of length l is uniformly heated from 0-C to a temperature t-C- - is the coefficient of linear expansion and E is modulus of elasticity- The stress developed in the bar is

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Standard VII

Physics

Young's Modulus of Elasticity

A free bar of...

Question

A free bar of length $l$ is uniformly heated from $0^{\circ} C$ to a temperature $t^{\circ} C, α$ is the coefficient of linear expansion and $E$ is modulus of elasticity. The stress developed in the bar is

α t E

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\frac{α t E}{2}

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Zero

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\frac{l α}{E}

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Solution

The correct option is C Zero
If a bar is free, it will expand freely on heating and no thermal stress will develop. Thermal stress gets developed only when bar is constrained.
Hence, option (c) is correct.

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A free bar of length l is uniformly heated from 0∘C to a temperature t∘C,α is the coefficient of linear expansion and E is modulus of elasticity. The stress developed in the bar is

The correct option is C Zero If a bar is free, it will expand freely on heating and no thermal stress will develop. Thermal stress gets developed only when bar is constrained. Hence, option (c) is correct.

A free bar of length $l$ is uniformly heated from $0^{\circ} C$ to a temperature $t^{\circ} C, α$ is the coefficient of linear expansion and $E$ is modulus of elasticity. The stress developed in the bar is

The correct option is C Zero
If a bar is free, it will expand freely on heating and no thermal stress will develop. Thermal stress gets developed only when bar is constrained.
Hence, option (c) is correct.