Question

A physical quantity of the dimensions of length that can be formed out of c, G and $\frac {e^2}{4πε_0}$ is
[c is velocity of light, G is universal constant of gravitation and e is charge]

• A. $\frac {1}{c^2}[G\frac {e^2}{4πε_0}]^{\frac 12}$
• B. $c^2[G\frac {e^2}{4πε_0}]^{\frac 12}$
• C. $\frac {1}{c^2}[\frac {e^2}{G4πε_0}]^{\frac 12}$
• D. $\frac {1}{c}G\frac {e^2}{4πε_0}$

Answer 1

Answer: (A)

$\frac {1}{c^2}[G\frac {e^2}{4πε_0}]^{\frac 12}$

Answer 2

The correct option is (A): $\frac {1}{c^2}[G\frac {e^2}{4πε_0}]^{\frac 12}$.