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A, B, C are identical bulbs. How does th...

A, B, C are identical bulbs. How does the brightness of A and B change when the switch S is closed ?

A

the brightness of A increases and that of B decreases

B

the brightness of A does not change and that of B decreases.

C

the bright ness of both A and B decreases

D

the brightness of A increases and that of B does not change.

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