TOPIC :PROPERTIES OF MATTER
Number of questions are 287, Select_Question:

QUESTION
Q1) Two wires A and B are of the same material. Their lengths are in the ratio 1 :2 and the diameter are in the ratio 2:1. If they are pulled by the same force, then increase in length will be in the ratio [ CBSE-PMT 1988]




SOLUTION

Formula for Young's modulus is
Young's modulus
Since Y and F are same there fore
equations for modulus
since D1=2D2
L2=2 L1
substituting the values in above we get
l1:l2=1:8

Answer: (c)