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Question

The equivalent resistance between the points aa of the electrical network shown in the figure is
470453.JPG

A
6r
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B
4r
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C
3r
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D
r
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Solution

The correct option is D r
The equivalent circuit for the given electrical network is given in the first two diagrams.
This is a balanced wheatstone bridge, so the arm consisting 2r not in use. So, we have what is given in the last two diagrams.
So, the equivalent resistance between a and b is:
1r=12r+12rr=2r2=r
504353_470453_ans.JPG

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