Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical PowerEasy2 minPYQ_2015

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A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

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Answer:

Solution:

The heat produced is given by $H = \frac{V ^{2}}{R} and R = \frac{ρ ℓ}{π r ^{2}}$ $∴ H = V^{2} (\frac{π r ^{2}}{ρ ℓ})$ or $H = (\frac{π V ^{2}}{ρ}) \frac{r ^{2}}{ℓ}$ Thus heat $(H)$ is doubled if both length $(ℓ)$ and radius $(r)$ are doubled.

Stream:BITSATSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical Power

⏱ 2mℹ️ Source: PYQ_2015

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