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Question

If the length of filament of a heater is reduced by 10%, the power of the heater will

A
increase by about 9%
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B
increase by about 11%
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C
increase by about 19%
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D
increase by about 10%
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Solution

The correct option is D increase by about 10%
P=V2RR=ρlAP=V2Aρl
Pα1l [Keep in v2Aρ constant]
with reduction of l by 10% power will increase by 10%.

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