Twelve > Electrical Circuits
In a meter bridge, a 30 $\rm \Omega$ resistance is connected in the left gap and a pair of resistances P and Q in the right gap. Measured from the left, the balance point is 37.5 cm when P and Q are in series and 71.4 cm when they are parallel. The values of P and Q (in $\rm \Omega$) are
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