In the circuit shown in figure, what will be the effective resistance between point A and B ?
A
r
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B
r2
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C
r3
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D
2r
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Solution
The correct option is Br2 The upper five resistance between A and B will form a balanced Wheatstone bridge hence there will be no current in the arm CO
the equilibrium circuit will be shown in fig.2
hence the resistance of arm ACB,AOB, and AB are all in parallel
the effective resistance between A and B is given as