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With resistances P and Q in the left and right gaps respectively of a metre bridge, the null point divides

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With resistances P and Q in the left and right gaps respectively of a metre bridge, the null point divides the wire in the ratio 1 : 2. If P and Q are increased by 20Ω each, the null point divides the wire in the ratio 3 : 4. Find value of P and Q.  

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∴ P = 10Ω, Q = 20Ω

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