A potentiometer circuit is shown in Figure 3 below. AB is a uniform metallic wire having length of…
Physics20203 marksShort answer
A potentiometer circuit is shown in Figure 3 below. AB is a uniform metallic wire having length of $2\text{ m}$ and resistance of $8\ \Omega$. The batteries $E_1$ and $E_2$ have emfs of $4\text{ V}$ and $1\cdot5\text{ V}$ and their internal resistances are $1\ \Omega$ and $2\ \Omega$ respectively.
Figure 3
(i)[2.0]
When the jockey J does not touch the wire AB, calculate:
(a) the current flowing through the potentiometer wire AB.
(b) the potential gradient across the wire AB.
(ii)[1.0]
Now the jockey J is made to touch the wire AB at a point C such that the galvanometer (G) shows no deflection. Calculate the length AC.
