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Question

Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is

A
3R2
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B
R2
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C
R
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D
2R
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Solution

The correct option is C R
Redrawing the circuit we observe that it is a balanced wheatstone bridge .

So, we know that ,

R1R4=R2R3

R1R2=R3R4

If this condition satisfies then RDE become redundant and here it satisfies the equations. Thus, RDE is redundant.

Req=2R×2R2R+2R=4R24R = R

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