wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

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
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Bulb B1 becomes dimmer
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
No change occurs in the brightness
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Bulb B1 becomes brighter if bulb B2 is disconnected and dimmer if bulb B3 is disconnected
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
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.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon