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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2020

PhysicsEasysingle choice

An electrical cable of copper has just one wire of radius $9 m m$ and its resistance is $5 Ω$ . This single copper wire of cable is replaced by $6$ different well-insulated copper wires, each of radius $3 m m$ . The total resistance of cable will now be equal to

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Answer:

Solution:

$R \propto \frac{1}{r^{2}}$

$∵ R a d i u s 9 m m ⟶ 3 m m$

$\Rightarrow R e s i s t a n c e 5 Ω ⟶ 45 Ω$

$R e s u l t o f s i x p a r a l l e l w i r e s = \frac{45}{6} = 7.5 Ω$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2020

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