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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2009

PhysicsEasysingle choice

When a current is passed in a conductor, $3^{\circ} C$ rise in temperature is observed. If the strength of current is made thrice, then rise in temperature will approximately be

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Answer:

Solution:

$(b) : H = I^{2} Rt = m c Δ θ ∴ Δ θ \propto I^{2}$ Hence $\frac{Δ θ _{2}}{Δ θ _{1}} = (\frac{I _{2}}{I _{1}})^{2}$ or $\frac{Δ θ _{2}}{3} = (\frac{3 I}{I})^{2}$ or $Δ θ_{2} = 9 \times 3 = 2 7^{\circ} C$

Stream:AIIMSSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2009

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