Question

Pls guys it’s imp class 11 physics chp2 dimension

Answer 1

Answer:

Put fundamental dimensions form of G in each option and check if it satisfies both sides

$G = M {}^{ - 1} L {}^{3} T {}^{ - 2}$

Ignore the constants , you only need to check if dimension is same or not .

Option first

$T {}^{2} = L {}^{2}$

Which is not correct

Option 2

$\frac{L {}^{2} }{G} = \frac{ L {}^{2}}{M {}^{ - 1} L {}^{3} T {}^{ - 2} } \neq {T }^{2}$

Option 3

M won't cancel ( No need to calculate all options , if answer is objective , guess is enough )

**speed is important

Option 4

$\frac{ L {}^{3} }{M M {}^{ - 1} L {}^{3} T {}^{ - 2} } = {T}^{2} \:$

So answer is

$\huge\pink{option \: 4}$