Find the net resistance between a and b, all resistors being r
A
4r/3
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B
3r/4
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C
r/4
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D
4r
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Solution
The correct option is A
4r/3
This circuit can be minimized as: The effective resistance of the three parallel resistors is given by 1R=1r+1r+1r ∴R=r3 ∴ Overall effective resistance r+r3=4r3