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if the electrc current in a lamp decreas...

if the electrc current in a lamp decreases by `5%` then the power output decreases by

A

`20%`

B

`10%`

C

`5%`

D

`2.5%`

Text Solution

Verified by Experts

The correct Answer is:
B
`P =i^(2) R rArr Palpha i^(2) rArr (DeltaP)/P xx 100 = 2 xx (Deltal)/I xx 100`
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