If the speed of light (c), acceleration du

Your Ultimate Guide to JEE & NEET Question Solutions

If the speed of light $(c)$, acceleration due to gravity $(g)$ and pressure $(p)$ are taken as the fundamental quantities, then the dimension of gravitational constant is

A

${c^2}{g^0}{p^{ - 2}}$

B

${c^0}{g^2}{p^{ - 1}}$

C

$c{g^3}{p^{ - 2}}$

D

${c^{ - 1}}{g^0}{p^{ - 1}}$

If the speed of light $(c)$, acceleration due to gravity $(g)$ and pressure $(p)$ are taken as the fundamental quantities, then the dimension of gravitational constant is

Let $[G] \propto {c^x}{g^y}{p^z}$

by substituting the following dimensions :

$[G] = [{M^{ - 1}}{L^3}{T^{ - 2}}],\,[c] = [L{T^{ - 1}}],[g] = [L{T^{ - 2}}]$

$[p] = [M{L^{ - 1}}{T^{ - 2}}]$

and by comparing the powers of both sides we can get $x = 0,\,y = 2,\,z = - 1$

$\therefore $ $[G] \propto {c^0}{g^2}{p^{ - 1}}$