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In comparing the resistance of two cells...

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

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