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Two light bulbs shown in the circuit hav...

Two light bulbs shown in the circuit have rating `A(24 V, 24W) and B(24 V and 36W)` as shown. When the switch is closed,

A

the intensity of light bulb A increases.

B

the intensity of light bulb A decreases

C

the intensity of light bulb B increases

D

the intensity of light bulb B decreases

Text Solution

Verified by Experts

The correct Answer is:
B, C
b., c.
For a bulb `R = V^2/W` or `R_(B)leR_(A)`
when switch is open `I_A = I_(B)`
`P_(A) = R_(A)I_(A)^(2)`
`P_A = R_(A)I_(A)^(2)`
`P_(B)ltP_(A)` and `V_(A)gtV_(B)`
`V_(A)gt12V` and `V_(B) lt 12V`
After closing the switch
`V = V_(B) = 12 V` or `P_(B) = 36W`
`P_(A) = 24W` .
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