Question

If and are the filament resistances of a 200 W bulb and a 100 W bulb respectively designed to operate on the same voltage, then

A

B

C

D

Medium

Solution

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Correct option is
B

Given that,
Power of bulbs               

The power , and      

On substituting we get,     .

Here, the power used in case of is ..........(1)

The power used in case of is .........(2)

On taking ration,
             .

Hence, .
Option B

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