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Q.

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

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a

increase by about 9%

b

increase by about 11%

c

decrease by about 11%

d

decrease by about 9%

answer is B.

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Detailed Solution

New resistance:  R' =   ρ 0.9 LA =  0.9  RP' =V2R' = V0.9 R = P0.9Increase in power: P'−PP× 100 =1009 =11%
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If the length of the filament of a heater is reduced by 10%, the power of the heater will