Q1. If $\epsilon _ { 0 }$ is the permittivity of free space and E is the electric field, then $\epsilon _ { 0 } \mathrm { E } ^ { 2 }$ has the dimensions :\\
(1) $\left[ \mathrm { M } ^ { - 1 } \mathrm {~L} ^ { - 3 } \mathrm {~T} ^ { 4 } \mathrm {~A} ^ { 2 } \right]$\\
(2) $\left[ \mathrm { ML } ^ { 2 } \mathrm {~T} ^ { - 2 } \right]$\\
(3) $\left[ \mathrm { M } ^ { \circ } \mathrm { L } ^ { - 2 } \mathrm { TA } \right]$\\
(4) $\left[ \mathrm { ML } ^ { - 1 } \mathrm {~T} ^ { - 2 } \right]$