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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumsingle choice

Two rods of lengths $l_{1}, l_{2}$ have linear expansion coefficients $α_{1}, α_{2}$ . If the difference in their lengths is independent of temperature, then:

Options:

Answer:

Solution:

$l_{1} (T) - l_{2} (T) = l_{1} - l_{2} + (l_{1} α_{1} - l_{2} α_{2}) Δ T$ . The coefficient of $Δ T$ must vanish. $l_{1} α_{1} = l_{2} α_{2}$ , giving option A.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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