Three bulbs B1,B2 and B3 are connected to the mains as shown in the figure. How will the brightness of bulb B1 be affected if B2 or B3 are disconnected from the circuit?
A
Bulb B1 becomes brighter
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B
Bulb B1 becomes dimmer
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C
No change occurs in the brightness
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D
Bulb B1 becomes brighter if bulb B2 is disconnected and dimmer if bulb B3 is disconnected
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Solution
The correct option is B Bulb B1 becomes dimmer Let R be the resistance of each bulb connected in this circuit.
The equivalent resistance in this case would be Req=R+R2 Req=3R2
But if one of the bulb (i.e B2 or B3) gets disconnected
The effective resistance would be Req=2R
Thus, in the later case the resistance gets increased due to which current flowing the circuit will decrease which would ultimately lead to bulb B1 becoming dimmer.