Question 327 of 404

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 × 10–4 A

(2) 8 × 10–4 A

(3) 4 × 10–3 A

(4) 8 × 10–3 A