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Q.

Three identical lamps of constant resistance A, B and C are connected in a circuit. If B burns out the lamp A will


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a

Have no effect on the other lamp

b

stop glowing

c

still glows

d

Both 1 and 3 

answer is B.

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Detailed Solution

 Three identical lamps of constant resistance, A, B, and C, are connected in a circuit. If B burns out, lamp A will stop glowing.
If the current flows in two lamps, A and B, arranged in series, and the filament of one lamp B breaks, the other lamp stops glowing; this happens because when one lamp breaks, the circuit here is broken, and the current to the other lamp is cut off. At the same time, there will be no effect on lamp C since it is connected in parallel.
 
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