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If voltage across a bulb rated 220 V-100...

If voltage across a bulb rated 220 V-100 W drops by `2.5%` of its rated value, then the percentage of the rated value by which the power would decrease is

A

`5%`

B

`10%`

C

`20%`

D

`25%`

Text Solution

Verified by Experts

The correct Answer is:
A
`P prop V^(2)` So `(DeltaP)/(P) xx 100 = 2 (Delta V)/( V) xx 100 = 5%`
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ALLEN-PHYSICAL WORLD, UNITS AND DIMENSIONS & ERRORS IN MEASUREMENT -EXERCISE-II AIPMT (PRE) 2012
  1. If voltage across a bulb rated 220 V-100 W drops by 2.5% of its rated ...

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