Current Electricity and Electrical InstrumentHard

Question

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

Options

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

Solution

P ⇒         ......(i)
       ......(ii)
from eq. (i) & (ii) P′ = P
× 100 ⇒ × 100 ⇒ × 100 ⇒ 11.11 %

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