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Question: When the switch is open, how are the bulbs connect...

When the switch is open, how are the bulbs connected to each other?

Rank the four bulbs in Figure 6 in order of descending brightness when the switch is open.

When the switch is closed in Figure 6, how are the bulbs connected to each other?

Rank the four bulbs in Figure 6 in order of descending brightness when the switch is closed.

This was the previous answer and was incorrect...

when switch is open A , B , C are connected in parallel and all the three are connected in series to D

when switch is closed A , B , C are shortcircuit and D is connected in series to battery.

A , B , C does not glow since potential across them is 0 due to shortcircuit

only D glows

Explanation / Answer

When the switch is open, B and C are connected in series and their combination is in parallel with the A and ; the combination of A (BC) is in series with D.

D > A > B = C

When the switch is closed, the bulbs B and C are in parallel to each other and their combination is in parallel to A. The combination of A (BC) will be in series with D.

D> A = B = C

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