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PhysicsCurrent ElectricityEquivalent ResistanceHard2 minPYQ_2013

PhysicsHardsingle choice

Seven resistance are connected between points $A$ and $B$ as shown in adjoining figure. The equivalent resistance between $A$ and $B$ is

Options:

Answer:

Solution:

The equivalent circuit of the given circuit is
This is a balanced Wheatstone bridge. Therefore, the arm CD becomes in effective. Hence $5Ω$ and $3Ω$ are in series and they together are in parallel with $(5 + 3) Ω$ $∴ Net resistance = \frac{( 5 + 3 ) + ( 5 + 3 )}{( 5 + 3 ) \times ( 5 + 3 )} = 4Ω$

Stream:VITEEESubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2013

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