Physical World Units and Measurements - Result Question 22

24. The force F on a sphere of radius ’ a ’ is moving in a medium with velocity v is given by F= 6πη av. The dimensions of η are

(a) [ML3]

(c) [ML1]

(b) [ML2]

(d) [ML1T1]

[1997]

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Answer:

Correct Answer: 24. (d)

Solution:

  1. (d) F=6πηav

η=F6πav=[MLT2][L][LT1]=[ML1T1]



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