Back to Current Electricity A potentiometer wire PQ of 1 m length is
connected to a standard cell E
1
. Another cell E
2
of emf 1.02 V is connected with a resistance ‘r’
and switch S (as shown in figure). With switch
S open, the null position is obtained at a
distance of 49 cm from Q. The potential
gradient in the potentiometer wire is :
Class 12 • Physics • Chapter-3
Current Electricity
Question 332 of 735
332MediumJEE Mains2020
