What will happen to the balancing length in metre bridge if (i) resistance r is increased (ii) thickness of bridge wire is made 1.5 times?
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The ratio of the voltages (voltage from one end to the balance point to the balance point to the other end) remains the same, so the balance point is not affected in either case.
The ratio of the known resistance to the unknown resistance depends on the ratio of the voltages in the bridge when the bridge is in balance.
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