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In the following circuit a 10 m long potentiometer wire with resistance 1.2 ohm/m, a resistance R1 and an accumulator of emf 2 V are connected in series. When the emf of thermocouple is 2.4 mV then the deflection in galvanometer is zero. The current supplied by the accumulator will be

  1. 4×104 A
  2. 8×104 A
  3. 4×103 A
  4. 8×103 A


Solution

The correct option is A 4×104 A
E=xl=iρl            i=Eρl=Eρl=2.4×1031.2×5=4×104 A

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