Two resistances are connected in two gaps of a meter bridge. The balance point is ${\rm{20}}\,\,{\rm{cm}}$ from the zero end. A resistance of $15\,\,{\rm{\Omega }}$ is connected is series with the smaller of the two. The null point shifts to ${\rm{40}}\,\,{\rm{cm}}$. The value of the smaller resistance in ${\rm{ohm}}$ is

JEE PHYSICS MCQ: CURRENT ELECTRICITY

1 Medium

1 of 1

Application +4 | -1

Two resistances are connected in two gaps of a meter bridge. The balance point is

\mathrm{20}\,\,\mathrm{cm}

from the zero end. A resistance of

15\,\,\mathrm{\Omega }

is connected is series with the smaller of the two. The null point shifts to

\mathrm{40}\,\,\mathrm{cm}

. The value of the smaller resistance in

\mathrm{ohm}

View answer and explanation

Correct option: C

Option C (9) is correct because it is obtained by solving the equations derived from the meter bridge principle.