MCQ
A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is $k$ $volt/cm$ and the ammeter, present in the circuit, reads $1.0\,\, A$ when two way key is switched off. The balance points, when the key between the terminals $(i)$ $1$ and $2$ $(ii)$ $1$ and $3,$ is plugged in, are found to be at lengths $l_1$ and $l_2$ respectively. The magnitudes, of the resistors $R$ and $X,$ in $ohms$, are then, equal, respectively, to
- A$k(l_2 -l_1)\,Ω , kl_2\,Ω$
- ✓$kl_1 \,Ω , k(l_2 - l_1)\,Ω$
- C$\;{\rm{k}}\left( {l_2 - l_1} \right)\,\Omega {\rm{\;}},{\rm{\;\;k}}l_1{\rm{\;}}\,\Omega {\rm{\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;}}$
- D$kl_1 \,Ω , kl_2\, Ω$
