In comparing the resistance of two cells `P and Q` with a sides wire bridge, a balance point is obtained when the sliding contact is `30 cm` from the zero end of the wire. The resistances `P and Q` are interchanged and the balance is obtained at `120 cm` from the same emf. Find the ratio of the resistance `P and Q` and the length of the bridge wire

In comparing the resistance of two cells `P and Q` with a sides wire b

1.	In comparing the resistance of two cells `P and Q` with a sides wire bridge, a balance point is obtained when the sliding contact is `30 cm` from the zero end of the wire. The resistances `P and Q` are interchanged and the balance is obtained at `120 cm` from the same emf. Find the ratio of the resistance `P and Q` and the length of the bridge wire
Answer» Correct Answer - `150 cm` Let `1` be the total length of bright wire AS per question `(P)/(Q) = (30)/(l - 30)`…..(i) and `(Q)/(P) = (120)/(l - 120) or (P)/(Q)= (l - 120)/(120)`……(ii) Solving (i) and (ii) we get `(P)/(Q) = (1)/(4) and l = 150 cm`

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