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If the length of the filament of a heater is reduced by 10%,how the power of the heater will be changed & how much?
Verified Answer
If the length of the filament of a heater is reduced by 10%,how the po...
we know that P=V^2/R

=V^2/ρl/A

P'=1/(l-10/100l)

P'/P=l/(l-l/10)=10/9

P'-P/P*100=10/9*100

=11%

SO it increases by 11%
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If the length of the filament of a heater is reduced by 10%,how the power of the heater will be changed & how much?
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