If e is the electronic charge, c is the speed of light in free space and h is Planck's constant, the quantity ${1 \over {4\pi {\varepsilon _0}}}{{|e{|^2}} \over {hc}}$ has dimensions of :
$[ML{T^{ - 1}}]$
$[ML{T^0}]$
$[{M^0}{L^0}{T^0}]$
$[L{C^{ - 1}}]$
Solution
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