Potentiometer wire PQ of length 1m is connected to a standard cell E1. Another cell of E2 of emf 1.02v is connected with a resistance 'r' and with a switch 'S' as shown in the circuit diagram. With switch S is open, the null position is obtained at a distance of 49 cm from Q. Calculate the potential gradient in the potentiometer wire is:- 
Option: 1 0.02 V/cm
Option: 2 0.04 V/cm
Option: 3 0.03 V/cm
Option: 4 0.01 V/cm
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