Tunes File Edit Song View Controls Account Window Hep NBA 2K18 PERFECT FACE- Sec

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Tunes File Edit Song View Controls Account Window Hep NBA 2K18 PERFECT FACE- Sec 20.1- D https://www.webassign.net/web/Student Updstes Available Do you want to nstall the updales now 7177469 C Search Later /1 points Ask Your Tea What happens to the brightness of A when the switch is closed and identical bulb B also is connected in parallel across the same battery? After the switch is closed, how do bulbs A and B compare in brightness? O A dims when the switch is closed, and afterward A B O A stays the same, afterward A B. O A dims, afterward AB O A stays the same, afterward A B. O A gets brighter, afterward A > B. Additional Materials Section 20.1 My Notes O Ask Your Tea

Explanation / Answer

when the switch is not closed, current in circuit is i
when the switch is closed, the current in the circuit changes to 2i, as bpth bulbs are in parallel and identical so the effective resistance has fallen to half of the previous value

now, current flowing through both the bulbs still remains the same
so Brightness of bulb A remains the same and Bulb B starts to glow with same brightness as that of bulb A

hence option D
A stays the same, afterward A = B

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