JEE PYQ: Units And Dimensions Question 22
Question 22 - 2019 (11 Jan Shift 2)
If speed (V), acceleration (A) and force (F) are considered as fundamental units, the dimension of Young’s modulus will be:
(1) $V^{-2}A^2F^{-2}$
(2) $V^{-2}A^2F^2$
(3) $V^{-4}A^{-2}F$
(4) $V^{-4}A^2F$
Show Answer
Answer: (4)
Solution
Let $[Y] = [V]^a [F]^b [A]^c$. Comparing dimensions: $b = 1, a = -4, c = 2$. So $[Y] = [V^{-4}A^2F]$.