Question # 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

# 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 )

Solution

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