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Q.

In the given diagram, there are two switches  S1 and  S2 and two bulbs X and Y are connected as shown. If switch  S1 is closed and switch   S2 is open then.

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a

Only bulb Y will glow

b

Both bulbs X and Y will glow

c

Only bulb X will glow

d

Neither bulb X nor bulb Y will glow.

answer is B.

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Detailed Solution

Only bulb Y will glow. Because the path for the flow of current is compete only for the bulb ‘Y’.

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