NEET Questions Solved

PMT - 1976

Two resistances are joined in parallel whose resultant is 68 ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was 

(1) 3/5

(2) 2

(3) 6/5

(4) 3

(3) If resistances are R1 and R2 then R1R2R1+R2=68 …..(i)

Suppose R2 is broken then R1=2Ω  …..(ii)

On solving equations (i) and (ii) we get R2=6/5Ω 

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