A physical quantity of the dimensions of length that can be formed out of c , G and e 2 4 π ε 0 , where [ c…

A physical quantity of the dimensions of length that can be formed out of c, G and e24πε0, where [ c is velocity of light, G is universal constant of gravitation, e is charge & ε0 is permittivity of free space]:
  1. 1c2Ge24πε012
  2. c2Ge24πε012
  3. 1c2e2G4πε012
  4. 1cGe24πε0

Solution

Let e24πε0=A=ML3T-2
L=Cx GyAz
[ L ]=LT-1x M-1 L3 T-2y ML3 T-2z
-y+z=0     y=z ......(i)
x+3y+3z=1 ......(ii)
-x-4z=0 ......(iii)
From (i), (ii) and (iii)
z=y=12, x= -2

Asked in: NEET 2017

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