Physics · PYQ NEET UG 2017

A physical quantity of the dimensions of length that can be formed out of \( c \), \( G \) and \( \frac{e^2}{4\pi\varepsilon_0} \) is [\( c \) is velocity of light, \( G \) is universal constant of gravitation and \( e \) is charge]:

1. A
   \( \frac{1}{c^2}[G \frac{e^2}{4\pi\varepsilon_0}]^{1/2} \)
2. B
   \( c^2[G \frac{e^2}{4\pi\varepsilon_0}]^{1/2} \)
3. C
   \( \frac{1}{c^2}[\frac{e^2}{G 4\pi\varepsilon_0}]^{1/2} \)
4. D
   \( \frac{1}{c}[G \frac{e^2}{4\pi\varepsilon_0}]^{1/2} \)