JEE PHYSICS MCQ: CURRENT ELECTRICITY

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An unknown resistance

{R_1}

is connected in series with a resistance of

\mathrm{10}\,\,\mathrm{\Omega }

. This combination is connected to one gap of meter bridge while a resistance

{R_2}

is connected in the other gap. The balance point is at

\mathrm{50}\,\,\mathrm{cm}

, Now, when the

\mathrm{10}\,\,\mathrm{\Omega }

resistance is removed the balance point shifts

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

. The value of

{R_1}

(in ohm) is

View answer and explanation

Correct option: A

\begin{array}{llllllllllllllllllll} {\mathrm{20}} \end{array}

Option A (20) is correct because it is derived from the meter bridge balance condition equations.

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