Two resistances are joined in para...
Question
 Two resistances are joined in parallel whose resistance is 3/5Ω. One of the resistance wire is broken and the effective resistance becomes 3Ω. The resistance in ohm
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Two resistances are joined in parallel whose resistance is ( 3 / 5 Omega ). One of the resistance wire is broken and the effective resistance becomes ( 3 Omega . ) The resistance in ohm of the wire that got broken was
(a) ( 4 / 3 )
( (b) 2 )
(c) ( 6 / 5 )
(d) ( 3 / 4 )

JEE/Engineering Exams
Physics
Solution
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 Two resistances are joined in parallel whose resistance is 3/5Ω. One of the resistance wire is broken and the effective resistance becomes 3Ω. The resistance in ohm of the wire that got broken was
Fullscreen

Req when nothing is broten
[
R_{c} c=3 / 5 Omega
]
Wet wire of Ris bollen ( Rightarrow operatorname{Reg}=R_{2}=3 Omega )
[
begin{array}{l}
text {  } frac{1}{3}+frac{1}{R_{1}}=frac{1}{R_{2}}
begin{array}{ll}
Rightarrow frac{1}{3}+frac{1}{R_{1}}=frac{5}{3}
Rightarrow R_{1}=3 / 4 Omega
end{array}
end{array}
]
(d) Ans

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