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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicEasy2 minQB

PhysicsEasysingle choice

A conducting wire of length $l$ , area of crosssection $A$ and electric resistivity $ρ$ is connected between the terminals of a battery. A potential difference $V$ is developed between its ends, causing an electric current. If the length of the wire of the same material is doubled and the area of cross-section is halved, the resultant current would be___

Options:

Answer:

Solution:

As per the question

Resistance $= \frac{ρ ( 2 l )}{( A /2 )} = \frac{4 ρl}{A}$

$\Rightarrow$ Current $= \frac{V}{R} = \frac{V A}{4 ρl}$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: QB

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