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Q.

In the figure, the value of resistance to be connected between C and D so that the resistance of the entire circuit between A and B does not change with the number of elementary sets used is

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a

R

b

R(3−1)

c

3R

d

R(3+1)

answer is B.

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Detailed Solution

Resistance between AB is independent of number of sets used. Let x be the Reff between ABA=R∥2R+RrR+r →(1)x=R∥[2R+x]→ solve for r
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