menu search
brightness_auto
Feel free to answer or ask any questions.
If you are new here please see how to use or FAQ.
more_vert

Two solid conductors are made up of same material, have same length and same resistance. One of them has a circular cross section of area A1 and the other one has a square cross section of area A2. The ratio A1/A2 is 

(1) 2 

(2) 1.5 

(3) 1 

(4) 0.8

1 Answer

more_vert
 
verified
Best answer

Ans: (3) 1

Sol. Resistance of conductor is given as

$R={\rho l\over A}$

$\ \therefore\quad A={\rho l\over R}$

$\implies{A_1\over A_2}={\rho_1 \over \rho_2}\times{l_1 \over l_2}\left({R_2 \over R_1}\right)$

$\implies{A_1\over A_2}=1\quad$ [∵ R1 = R2, l1 = l2 and for same material $\rho_1=\rho_2$]

thumb_up_off_alt 2 like thumb_down_off_alt 0 dislike

Welcome to Jee Neet QnA, where you can ask questions and receive answers from other members of the community.


Join our Telegram group for live discussion.

Telegram Group

Subscribe our YouTube channel for video solutions with explanation.

YouTube Channel

Download Jee Neet QnA Books in PDF for offline learning.

Jee Neet QnA Books

1.2k questions

842 answers

384 comments

110 users

...