A potentiometer wire AB is 100 cm long and has a total resistance of 10 ohm. If the galvanometer shows zero deflection at the position C, then find the value of unknown resistance R.

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TestHub · Accepted Answer

V A C ​ = 0.4 × 10 = 4 V 5 − i ( 1 ) = 4 i = 1 A i ( R ) = 4 R = 4Ω

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