LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
29 views
in Physics by (38.7k points)
closed by

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by ∆l on applying a force F, how much force is needed to stretch the second wire by the same amount?

(A) 9 F 

(B) 6 F 

(C) 4 F 

(D) F

1 Answer

+1 vote
by (39.4k points)
selected by
 
Best answer

(A) 9 F

As material is same, Young’s modulus of two wires is same.

Also, volume of both wires is same.

V1 = V2

To stretch the second wire through same length (△l), let force needed be F'

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...