Answer is (A)
For potentiometer, when null point is obtained for a particular cell (EV) at L $\mathrm{cm}$, (say).
Whose length is $\mathrm{x} \mathrm{cm} \quad \therefore \mathrm{E}=\mathrm{L} \cdot \mathrm{V}$ volts
When the length is increased from $x$ to $x^{\prime}$ then
$\mathrm{E}^{\prime}=\mathrm{L}^{\prime} \cdot \mathrm{V} \text { volts. }$
$\therefore$ The balancing length increases when if the length of the potentiometer wire increases.
Hence (A) is correct choice.
In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire $\mathrm{x} \mathrm{cm}$ long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed)
A) increase
B) decrease
C) not change
D) becomes zero
A) increase
B) decrease
C) not change
D) becomes zero
In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire $\mathrm{x} \mathrm{cm}$ long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed)
A) increase
B) decrease
C) not change
D) becomes zero
A) increase
B) decrease
C) not change
D) becomes zero