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SAT® Subject Test in Physics

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Five Bulb Brightness Change

SATPHY-YQYQVX

The circuit pictured below includes a battery, along with 6 identical light bulbs arranged and numbered as shown.

At first, all light bulbs are screwed in and lit up.

Lightbulb number 5 is unscrewed from its socket so that it goes out.

Which table best describes what happens to the brightness of the remaining 5 lightbulbs (brighter, dimmer, or out–giving off no light at all) after lightbulb number 5 is unscrewed?

A
Lightbulb 1 brighter
Lightbulb 2 dimmer
Lightbulb 3 dimmer
Lightbulb 4 out
Lightbulb 6 brighter
B
Lightbulb 1 dimmer
Lightbulb 2 dimmer
Lightbulb 3 dimmer
Lightbulb 4 dimmer
Lightbulb 6 dimmer
C
Lightbulb 1 out
Lightbulb 2 brighter
Lightbulb 3 brighter
Lightbulb 4 out
Lightbulb 6 out
D
Lightbulb 1 dimmer
Lightbulb 2 brighter
Lightbulb 3 brighter
Lightbulb 4 out
Lightbulb 6 dimmer
E
Lightbulb 1 dimmer
Lightbulb 2 out
Lightbulb 3 out
Lightbulb 4 out
Lightbulb 6 dimmer