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  4. In the given figure switches S1 and S2 are in open condition. The resistance across ab when the switches S1 and S2 are closed is Ω.

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Q. In the given figure switches $S_{1}$ and $S_{2}$ are in open condition. The resistance across ab when the switches $S_{1}$ and $S_{2}$ are closed is _______$\Omega$.Physics Question Image

JEE MainJEE Main 2021Current Electricity

Solution:

when switch $S_{1}$ and $S_{2}$ are closed
image
$\frac{12 \times 6}{12+6}+2+\frac{6 \times 12}{6+12}$
$\frac{72}{18}+2+\frac{72}{18}=4+2+4=10\, \Omega$