Questions
If the length of the filament of a heater is reduced by 10% by cutting its length, the power of the heater will be nearly, (if constant voltage is maintained across the heater)
detailed solution
Correct option is B
Power of a heater is given as P=V2R⇒P∝1R resistance of a wire is directly propotional to its length.⇒P2P1=R1R2=l1l2⇒P2=l1l2P1=l0.9lP1=1.11P1So, power will be increased by 11%.Talk to our academic expert!
Similar Questions
The heat generated in 5 resistor due to current flowing through it is 10 cal per sec. The heat generated in 4 resistor (in cal/sec) is _________
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