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Find the equivalent resistance between A And Din this circuit
The loop ABCDA shown in the circuit is a Wheatstone bridge circuit(rab/rad = rbc/rdc) in which points B and D are at same potential i.e, Vb = Vd.Hence no current will flow in the resistance r connected between B and D. Removing this resistance, the simplified circuit will now consist of three parallel branches of resistance between A and C:Branch ABC having resistance 2r (in which rab = r and rbc = r)Branch ADC having resistance 2r (in which rad = r and rdc = r) andBranch AC having resistance r.Thus equivalent resistance between A and D = rad = r Ans.
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