In a meter bridge experiment null point is obtained at $l \mathrm{~cm}$ from the left end. If the meter…
In a meter bridge experiment null point is obtained at $l \mathrm{~cm}$ from the left end. If the meter bridge wire is replaced by a wire of same material but twice the area of across-section, then the null point is obtained at a distance
$2 l \mathrm{~cm}$ from left end.
$l \mathrm{~cm}$ from left end.
$l / 2 \mathrm{~cm}$ from left end.
$l / 4 \mathrm{~cm}$ from left end.
Solution
At null condition, $\frac{\mathrm{R}_1}{\mathrm{R}_2}=\frac{\mathrm{X}}{100-\mathrm{X}}$
This condition is independent of the crosssectional area of the wire used.
$\therefore \quad$ The null point will remain the same. (i.e., $l \mathrm{~cm}$ from left end)