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  4. Four lamps are connected in the way as shown in figure. When switch S2 is open and switch S1 is on position- 2, Lamp- B2 is the brightest, and lamp B3 and lamp B4 are the dimmest and are of the same brightness. Now switch S2 is closed and S1 is on position- 1, the descending order of brightness of bulbs is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-p2xmaxwlvl16ftcb.jpg />

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Q. Four lamps are connected in the way as shown in figure. When switch $S_{2}$ is open and switch $S_{1}$ is on position- $2,$ Lamp- $B_{2}$ is the brightest, and lamp $B_{3}$ and lamp $B_{4}$ are the dimmest and are of the same brightness. Now switch $S_{2}$ is closed and $S_{1}$ is on position- $1,$ the descending order of brightness of bulbs is
Question

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
$\Rightarrow R_{2}>R_{1}>R_{3}=R_{4}$
Solution
$\Rightarrow $ Order of brightness $B_{1}>B_{4}>B_{3}>B_{2}$