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Question


The above configuration shows three identical bulbs, grade them in order of their brightness.

A
B3>B2=B1
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B
B1=B2>B3
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C
B3>B1>B2
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D
B2>B1>B3
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Solution

The correct option is A B3>B2=B1
Power consumed, P=i2R

Since all three bulbs are identical, so their resistance is same. So power consumed is directly proportional to the square of the current.

Pi2

B1 & B2 withdraw less current as compared to B3 because in series they have 2R resistance whereas R is the resistance due to B3. Moreover, current through B1 & B2 will be equal.

i3>i1=i2

And we know that brightness is directly proportional to the power consumed.

Brightness order: B3>B2=B1.

Hence, option (a) is correct.
Why this question?Tip: When identical bulbs are connected thenbrightness of that bulb will be more, where current is more or potential difference is more.

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