NEET Questions Solved

PMT - 2004

For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure 

(1) 4 Ω

(2) 6 Ω

(3) 2 Ω

(4) 5 Ω

(2) For balanced Wheatstone bridge PQ=RS

12(1/2)=x+6(1/2)x=6Ω 

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