QJEEM22Ph8fea: JEE Main 2022 Physics - Class 12 JEEM22Ph8fea Solution: Resistances are connected in a meter bridge circuit as shown in …

Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length $$l_1$$ is $$40\mathrm{cm}$$. Now an unknown resistance $$x$$ is connected in series with $$\mathrm{P}$$ and new balancing length is found to be $$80\mathrm{cm}$$ measured from the same end. Then the value of $$x$$ will be ____________ $$\mathrm{\Omega }$$.