Physics And Measurement Question 85

Question: A small steel ball of radius r is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity η . After some time the velocity of the ball attains a constant value known as terminal velocity vT . The terminal velocity depends on (i) the mass of the ball m , (ii) η , (iii) r and (iv) acceleration due to gravity g . Which of the following relations is dimensionally correct

[CBSE PMT 1992; NCERT 1983; MP PMT 2001]

Options:

A) vTmgηr

B) vTηrmg

C) vTηrmg

D) vTmgrη

Show Answer

Answer:

Correct Answer: A

Solution:

By substituting dimension of each quantity in R.H.S. of option

we get [mgηr] = [M×LT2ML1T1×L] = [LT1] .

This option gives the dimension of velocity.



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक