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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2020

PhysicsEasysingle choice

If a wire of resistance $R$ is melted and re-casted to half of its length, then the new resistance of the wire will be

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Answer:

Solution:

Resistance $R = \frac{ρ l}{A} = \frac{ρ l^{2}}{V}$

$\Rightarrow R \propto l^{2}$

as new length is $\frac{l}{2},$

new resistance $R^{'} = \frac{R}{4}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2020

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