Q.

The ring shown in fig. has zero resistance. The equivalent resistance between points A and B will be

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a

R

b

2 R

c

3R

d

4R

answer is D.

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Detailed Solution

The three resistances of 6 R resistance each are connected in parallel. Their equivalent resistance is 1R′=16R+16R+16R=36R or R′=2RThis R is in series with 2 R resistance. Hence, equivalent  resistance between B and A will beRAB=2R+2R=4R
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