Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • If the length of the filament of a heater is reduced by 10%, the power of the heater will  Option: 1  Increase by about 9%

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

Option: 1

 Increase by about 9%


Option: 2

 Increase by about 11%


Option: 3

 Increase by about 19 %

 


Option: 4

 Decrease by about 10 %


Answers (1)

best_answer

\begin{aligned} &\mathrm{ P=\frac{V^2}{\rho \frac{\ell}{a}} \Rightarrow P \propto \frac{1}{\ell}, P^{\prime} \propto \frac{1}{\ell-\frac{10}{100} \ell} }\\ &\mathrm{ \frac{P^{\prime}}{P}=\frac{10}{9} \Rightarrow\left(\frac{P^{\prime}}{P}-1\right) \times 100=\left(\frac{10}{9}-1\right) \times 100 }\\ &\mathrm{ \frac{P^{\prime}-P}{P} \times 100=\frac{100}{9} \approx 11 }\\ \end{aligned}

Posted by

Ritika Jonwal

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

Karnataka: NEET candidate dies by suicide; no note recovered
anam-khan

CBSE Re-evaluation Row: Dharmendra Pradhan seeks detailed report on technical failures
anam-khan

Before NEET, CMC Vellore’s unique MBBS admissions tested aptitude along with merit; paper-leak restarts debate

Latest Question